You'll need to replace your bottom bracket, front derailleur, rear derailleur, crankset, and at least the front shifter. Might as well toss a new chain on and replace some cables while you're at it.
It won't be cheap.
I suggest you call your LBS or check out some of the online vendors to find prices.
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Religion is a good thing for good people and a bad thing for bad people. --H. Richard Niebuhr