Wow... Sounds like .... Well.. Mix definitely needs help. A trick with guitars is to double track, triple track, quadruple track, and maybe even more with the guitars to thicken them up. The drums sound horribly huge, as well as the bass. The guitar sounds nice, bright, and tight, as well as the vocals. They sound like they were recorded in two entirely different rooms. Vocals are way, way too loud, and sound uncompressed. My guess is that your drums have serious phasing issues. I've found drums to be the hardest instrument by far to record. Also - six mics is plenty to get a good sound out of a drum kit. I'd check out the "recorderman" set up and learn from it (google and youtube can help you there).
So. track your guitars more and use panning on them. Compress your vocals. Re-arrange your mic set up for drums until you get a good sound (unless your drums sound crappy to begin with. If they sound like garbage going into the mic, it's darn near impossible to get anything but garbage out of the speakers). Your bass has some serious low-end problems, too. Even through my crappy earbuds, I can hear the crazy low-end frequencies heaping themselves upon each other.
I don't think your problem is your mics. Sounds like you've got at least mid-range mics (and in the case of SM-57 - that's a pro-grade mic right there, dude). Sounds like you just need patience with yourself, and more experience. Read up on recording techniques, and room treatment techniques, and you'll be amazed at what you can get out of a small room, and average mics.
Good luck dude... Anxious to hear how you improve in the near future!