Investors will try to tack another leg on to the year-long U.S. stock rally, looking to next week's economic data and statement from the central bank for evidence the recovery is still on track.

After tumbling during the fourth-quarter earnings season, the S&P 500 has climbed back to its mid-January levels, racking up a 17-month high earlier this week. However, the index's hold on the key 1,150 is tentative and it closed just below it on Friday, setting up a potential tug of war between the bulls and the bears.

If we get a big spike on the way up and it doesn't hold on the way down, it'll be negative for the market, said Joseph Benanti, managing director of sales and trade at Rosenblatt Securities in New York.

I'd like to see some consolidation at these levels to where people start to feel comfortable that the numbers are right, the earnings are in line with expectations and we can continue to build over the rest of the year.

Benanti said a push above 1,150 could lift the S&P 500 to 1,175 or 1,200.

The main event of the week will be the Federal Reserve's assessment of the economy at the end of its interest rate-setting meeting on Tuesday. The Fed is expected to hold benchmark rates near zero and reiterate its pledge to keep them low for an extended period.

Investors will be alert for a change in language that could signal when the Fed will begin to tighten its monetary policy, particularly after it raised the discount rate last month.

Key economic reports on tap includes regional manufacturing for March, leading economic indicators for February, housing starts for February, the Producer Price Index and the Consumer Price Index, both for February, and weekly initial jobless claims.

Market watchers will also have their eyes on Washington, where Senate Banking Committee Chairman Christopher Dodd is expected to unveil his bill on an overhaul of financial regulation. Bipartisan Senate talks over reform collapsed last week and any further signs of gridlock could buoy stocks.

IN THE BANK

Financial stocks could have momentum in their favor after being among the sector's leaders this week, giving a sense of deja vu as the market celebrated its one-year anniversary from the 12-and-a-half-year closing low last March.

At the time, the rally was sparked by optimistic comments from Citigroup and Bank of America . This week, the shares of companies such as Citigroup and American International Group were lifted by a similar shift in sentiment as investors bet the battered companies were on the road to recovery.

Short covering, as well as the potential setback for financial regulation, also bolstered the banking group. The S&P financial index <.GSPF> was up for the fourth week in a row, gaining 2.1 percent.

However, investors said the road to recovery is still a long one, and leadership could begin to shift out of the sector again. And while political limbo can boost stocks in the short term, long-term uncertainty can become a negative.

This broad-based increase, especially in the more speculative areas, might have problems continuing, though obviously in the short term, the momentum is there, said Alan Lancz, president of Alan B. Lancz & Associates Inc in Toledo, Ohio.

Benanti said investors could begin to shift into technology instead after the sector lagged at the start of the year. Tech shares are expected to benefit from a recovering economy as consumers and businesses spend more.

BUMPY RIDE

Wall Street could see more volatility than it has of late with four types of March futures and options contracts set to expire or settle at the end of next week, an event known as quadruple witching. The quarterly event tends to attract high volume as investors adjust or exercise their derivative positions.

Usually expiration weeks are positive but with the market up at new highs, it's hard to tell which way this one will pan out, said Paul Mendelsohn, chief investment strategist at Windham Financial Services in Charlotte, Vermont.

But it appears, at least so far, that this market wants to go higher.

While it will be mostly quiet on the earnings front, FedEx Corp is expected to report third-quarter results on Thursday. The package delivery giant is considered a bellwether of economic activity.

On the economic front, investors will take in two separate regional data reports with the Empire State manufacturing index on Monday and the Philadelphia Fed survey on Thursday. The Empire State index for March is expected to rise to 21.45 from 24.91 the month before, while the Philly Fed index is expected to climb to 18 in March from 17.6 the previous month, according to Reuters data.

On Tuesday, housing starts for February are expected to dip to an annual rate of 570,000 units from 591,000 the month before. The same day, February import prices are expected to dip 0.2 percent, compared with a gain of 1.4 percent in January.

Wednesday's Producer Price Index for February is expected to see a month-over-month dip of 0.2 percent, compared with a 1.4 percent gain the month before. Core PPI, excluding volatile food and energy prices, is forecast to rise 0.1 percent in February, following a 0.3 percent gain the previous month.

On Thursday, the Consumer Price Index for February is forecast to gain 0.1 percent, compared with an increase of 0.2 percent in January. Core CPI, which omits volatile food and energy prices, is forecast to rise 1.4 percent in February, following a 1.6 percent gain in January.

Providing a snapshot of the labor market, Thursday's initial claims for jobless benefits are expected to fall to 455,000 last week from 462,000 the week before. Also on Thursday, leading economic indicators for February are expected to rise 0.1 percent, less than the 0.3 percent gain the month before.

(Reporting by Leah Schnurr; Additional reporting by Chuck Mikolajczak; Editing by Jan Paschal)

Investment Manufacturing Citigroup