Man, just save yourself the frustration and get something decent. I forget who it is (SlackMaster2k?), but somebody on this BBS has a pretty applicable catch phrase for this situation. "Buy cheap, buy twice." I'd basically agree with that with a few exceptions of course for great deals. But AFAIK, there are no great deals in "computer mics" for serious recording. So do yourself a favor and get a Shure SM57 ($50 used) and some kind of mic preamp like an M-Audio DMP2 ($80 at Mars Music if you're lucky) or even (gasp) an ART Tube MP ($60 used). You will then have a decent little signal chain and something that will be useful even if you end up buying more equipment down the road.
Good Luck!