Thanks for the responses everyone (I thought I had auto-email notifications for replies, but I guess not, so I just noticed all of this today).

Without prior experience with it, I don't see a reason why I can't just bump the bus speed up to 167 MHz. It's two quick solders (one on the mobo, one on the dabo). I haven't been able to find any info online of anyone else doing that. Everything I've seen about bumping up the bus speed has involved buying the daughter board from a FW800 model that was already 167 MHz. Yay...

Maybe Mike from xlr8yourmac.com has some info he can pass on to me (which I'd then relay here)... Time to email him and see!

Oh, and as for the graphics card. I'll settle for a stock Radeon 9800 Pro Mac Edition (128MB), but if I can safely/affordably get something better, you better believe I will! : )
_________________________
DP 1.08GHz PMG4 MDD, 1GB PC2700 DDR, 200GB ATA (16MB, 7200RPM), Radeon 9800 Pro (256MB)