d3 should be okay, but frames will be fairly low. I'd jump to a 6670 if you can stretch it.
also, nice display pic. underoath fan?
I would love to put a 6670 into this computer, but that is out of the budget for the friend in which i am building this for. I feel like the 6670 would hit the sweet spot. He already has to pay me in increments and I am only charging him $250. That is for the whole computer peripherals and all. So what if it is a core 2 duo, it is a heck of a lot better then what he is running with now.
And yes i am a fan of Underoath, at one point considered my favorite band. For some reason I don't listen to them as much anymore though.