I've seen people post "public wish lists", but I'm not sure how to do it as I've never done that before. A screeny would be okay, but if you can figure out the public wish list, that's even better since we'll be able to just click on the links instead of typing stuff in if we have to.
GPU if you want DX10, GPU if you want 10.1. I'm not sure if there's a major difference or not between DX10 and 10.1, but I always go newer. I'm thinking they'd be pretty comparable. I'm thinking you'd gain some performance with a 1GB over that 384MB you listed, but I'm not sure. Someone can offer assistance here.
With rebates, this comes to ~$400 I think. I didn't factor in shipping.
EDIT: If you don't want shipping on the PSU, this would be fine; and no rebate hassle with that either. And, I said I wouldn't, but here's a cheaper case if you wanna do penny pinching.