Im using 2 x MOTU firewire 828mk MKs IIs which will do up to 20 each (with an extra ADAT interface and a mixer as they only have 2 pres each).

I think you are looking at a minimum of a Korg D3200 ($1299) or possibly a Korg D16XD which I think will do 12 simultaneous ins or a Rolland VS2400 ($2295) which will do 16 if you want to go the studio in a box rout.

And then there is the cost of the microphones which run from about $100 for a Shure SM57 to about 3k for a really nice LDC !