if it was me I'd go the firewire route. Get a Focusrite Saffire LE if you only need the two mic ins, it has 2 line ins on the back so you could theoretically do 4 tracks simultaneously. I use the Focusrite Saffire Pro 26 and Pro 10. The pres are some of the best on an interface period, especially for under $1k a piece. I think they are much better than anything by PreSonus and leaps and bounds above anything labeled M-Audio. Firewire has many advantages over USB with music. Firewire will have a larger amount of dedicated bandwidth. Chances are only your interface will be on the firewire card where with USB you have a mouse, hard drive, keyboard, or whatever else.
As far as mics I'd recommend spending $200-$300 on one mic of higher quality. Any condenser at $150 just won't give you much to work with. I've owned them and I hated myself for ever wasting my money on them, you'll never get anything for them when you realize they were a mistake. Look into new/used mics like the AT4050
CM/5, AT4040, AT4033
, AT4033/CL, AT4047, Sterling Audio ST55, Groove Tubes GT57/GT55, etc. Check out ebay, craigslist, and music go round. Don't forget to use resources like here or check sites like harmony central where you can access user reviews. As far as the imaging of toms it's all about personal preference. I use big drums and big cymbals and prefer the vintage sound so I like LDC mics. SDC mics also work well if you want to go that route check out the Rode NT5
pair or the Shure KSM137 pair/individual mics.
I would avoid using any Studio Projects mics and to a lesser extent the low end A/T mics. I would say hold off and pick up a second mic when you get the money. You will like yourself later down the road. Personally I use either AT4050
CM/5 or Sterling Audio ST79 in stereo pairs as overheads with e904 tom mics, e905 on snare, and then any number of mics on kick drum (I have like 5 kick mics that I go between/combine). Typically I like to use something like SM81
or KSM137 mics to mike up my hats and ride.