If you've got a decent computer already, you could pick up something like a MAudio Delta 1010 - that's a PCI card that has 10 line ins, 10 line outs (2 channels digital, 8 analog), 24 bit digital recording. I've got a Delta 66 and it does quite nice recording.
And pick up something like Cubase (software package) to handle the actual recording.. that'd give you 8 lines recorded, but it isn't
XLR, it is quarter inch.
Glancing around, that'd be about $450 for the 1010 and about the $500 for Cubase. That'd give you a half decent recording /and/ audio editing package, less, of course, monitors and all the nice to haves like
midi control platforms and stuff.
Generally in that case, you'd be running feeds from the
FOH mixer, but if that's not an option, you'd need a mixer to provide sufficient pre-
amps (and probably, as
DMX Tools suggests to mix down the drums to 2 channels)
Of course, all this is predicated on you have a PC you could use for the job
There are Firewire and USB Multi
channel audio cards that'd work with a laptop, but I've never seen one with decent latency. I am, however, about a year+ out of date in the home recording field. You could ask the 'Home Wreckers' over at Home Recording BBS -
http://www.homerecording.com/bbs/ - they'd be up to date on this stuff.
-OG