Well that's pretty much what I'm talking about. AMD isn't worth the money at $750--but since you're committed to expecting Bulldozer to be awesome (I really hope it is), save your money on your CPU that you plan on replacing.
Why spend $100 on a Phenom II x4 955BE when a Phenom II x3 720BE is on sale for $60? You'll see here that it's close to the 955 in gaming:
http://www.tomshardware.com/reviews/gaming-llano-processor,2989-5.html
And if you can unlock the 4th core and overclock, it's equal. If you can unlock, but it won't overclock, or simply overclock the 3 cores, then it's pretty close to the same as the 955.
Ask anyone and they'll agree that if you intend to upgrade your CPU soon, there's no point in getting the best out there--just get a great performer for it's price point. And for $75, the Phenom II x3 720BE cannot be beat. But it's only $60 right now.
By, the way, if you intend to spend $750, you should get an $80 to $90 case instead of the Thermaltake V4, and 8GB of RAM for $65 or less.
Let's talk about what AM3+ motherboard you're getting, what graphics card you're planning on, and what PSU that will need. There's no reason you can't fit my build below with a better case, mobo, PSU (750W), AND a Radeon 6970 for $750.