Mouse -
If you really wanna make your drums craccn, you MUST begin with good samples/sounds. Using a compressor on mediocre sounds will only yield slightly above mediocre results, although there will be a difference. Keep experimenting with layering differents sounds and tweak on your filters and attack and decay settings. Remember that, for the most part, you're manipulating sounds that were already tweaked to sound good in the first place!!! With a little patience, you'll eventually get them to work together for that sound you're looking for.
I'm not sure what they're going for currently, but the dbx 160x is a KILLER compressor for punching up kick and snare drums. It is one of the few cheap units that is consistently found and used in the big studios in LA and NY. It is my personal favorite for hip hop and metal/hard rock drums.
p.s. I'm not tryin' to start any crap, but the Alesis compressor is the absolute most horrid piece of garbage ever. Brutal on your signal. Then again, 20 years from now, some cat is gonna make it cool and it'll sell for $5000.