I'm a little confused too - almost any DSLR will do what you're looking for - except the 8mp resolution. The new Canon will be 8mp, and there are a couple others that are higher than that.

If it's print size you're worried about, a 6mp camera can do an impressive job. There are several that you could get two or three of for $5k, do everything you need it to do, and be able to make 30x40 prints from. I've got a Fuji S2 - you might want to check it out. It's got firewire connectivity and can be remotely controlled (completely) with a Mac. There's a new S3 coming out at some point, but you could probably get one of each for $5k!