And if you have educational discount, it's less. But...
The Mac Pro simply is NOT a gaming machine. Period. The biggest problem is the FB-DIMMs, which Anandtech did a good article on last year. They limit performance in gaming, plus they're significantly more expensive than regular DDR2. Add to that that relatively few games are even able to utilize dual-core CPUs, never mind 2 dual-cores. (I remember seeing reviews that indicate multi-core systems actually perform worse than single core machines in games that aren't optimized for multi-core.)
I really want a new Mac. But if Apple doesn't deliver a system that's affordable and is a true gaming-class box, well, I may just forget about the Mac. I've been making due with a G4 Mini since they came out and a DIY gaming PC, it wouldn't kill me to continue with them. But I, like many others, would vastly prefer a Mac, one that can be both a Mac and a (Windows) gaming machine.
So, in other words, if Apple doesn't release what I want to buy...I won't be buying from them at all. I vote with my dollars, as the saying goes.