Originally Posted by halfspeed
Before buying a new bottom bracket, try your new crankset with the one you have first.
Also if you want to try your current BB, be careful that when you buy a new crankset, you get one that fits square taper bottom brackets and not the newer splined BBs. If you get the Suginos everyone is recommending, then you'll be fine.
The reason I was suggesting that he might need a new bottom bracket is because of length. He might be able to get away with the old bracket (Do as halfspeed says and try it first) but my first guess is that it's going to be too long for the new narrower cranksets.
As for the front derailer, unless you are going with a indexed system, RP, you should be okay. You'll have to adjust the limiting screws but old derailers had excess travel in most cases. If you do have to replace it, they are cheap.