Due to the lack of reply I'll assume you only need CPU, GPU, RAM and mobo.
Everything but GPU is based on CPU so we'll start with that.
CPU:
I recommend:
Intel Core i7-3770 Ivy Bridge $299.99
Read more here:
http://www.anandtech.com/show/6396/the- ... 300-tested
Especially telling are the gaming benchmarks:
http://www.anandtech.com/show/6396/the- ... 0-tested/5
So, it outperforms the AMD equivalent in all but a few tests. It is $100 more but I think the added performance, especially in gaming, is worth it.
Motherboard:
I'm partial to ASUS so I tend to recommend that. Anything that fits your slot needs, has a 1155 CPU slot and the latest chipset (Z77) should be good though. It is important to look at the lay out of the board before purchasing. Just because it says it has a certain number of slots doesn't mean all are usable. Modern graphics cards take up 2 slots of space so anything under the GPU slot will be unusable.
I recommend the ASUS P6Z77-V Deluxe $289.99
http://www.anandtech.com/show/5833/asus ... w-your-sku
A good solid performer for the price point. Tests at the top or within a few tenths of a millisecond of the top for Z77 chipsets. Only draw back is it doesn't have older PCI slots. However, it does have two usable PCI x1 slots even if using SLI. This is important if you pan on running, or want to run a sound card and PCI SSD in the future. Newer cards use these slots, though if you want to run older cards this board won't work.
RAM:
Unless you're planning to overclock the CPU stick with DDR3 1600. Here again you're fine with most reputable manufacturers, though I have personal biases. 8GB is good enough for most things though you may want to leave room for expansion later.
I think the Mushkin Redline 2x4GB (8GB total) (CAS 7) is a great deal. $83.99
This leaves $526 for your GPU.
GPU:
For Single Card performance you really can't beat the GTX690 right now..however, that costs your entire budget so it's out. If you prefer nVidia cards then the 680 is good. If you prefer ATI then the 7970 is your card. The 7970 just barely edges out the 680 in the benchmarks and can be had for slightly less so that's what I recommend.
http://www.anandtech.com/show/6025/rade ... to-gtx-680
There are many manufacturers of this card but I think the XFX Double D 7970 GHz Edition (
http://www.newegg.com/Product/Product.a ... 6814150632) is a great buy. $449.99.
Which leaves around $75 for cooling solutions.
Unfortunately the 1155 chipset doesn't seem to have many options yet, but Zalman, Thermalright (not ThermalTake), Scyth and Xigmatek are good brands to look at. You budget will certainly allow for any of these.
I say not Thermaltake because they tend to perform below average and have high noise compared to the brands I mentioned, though there are always exceptions.
You can look at the reviews at
http://www.overclockers.com/reviews/cooling if you want specifics on these.
I think this is a good build for performance out of the box but also leaves room for expansion if you want to add more memory or a second GPU, SSD or soundcard.