td,
to be honest..a preamp and a compressor are 2 totally different things.
Although there are companies that sell"channel Strips" or combination Preamp/EQ/Compressors, the basic preamp is for amplifying a weak microphone or other lowlevel signal to line level.
But to get back to your question.
I would say that unless you are really experianced with compression and know EXACTLY what you want up front, I would stay away from compressing pretty much anything on the way in. Some folks will set up a compressor as a "Limiter" just for the occasional stray hit that would clip your converters, but once the egg is scrambled, you cant undo it later.
It is very easy to turn a vibrant kit into a pile of mush by putting too much compression, so be cautious with any effect you record along with any instrument be it compression, reverb, chorus...anything.
I just set my levels to be safe and "let er rip."