new build Gaming PC with $750 budget and black friday deals

Ok, so I know you can already build a pretty good gaming PC for $700 already, but with black Friday, you could do a lot better right?

I already have : monitor and peripherals, 700gig HDD (but it's basically gone, so I need another ), and 3x2gig ram sticks ( still need to get more because these are absolute shit ).

Question : I have Windows 7 installed on this hard drive, I don't have a key or a disc ( may have a recovery disk ) and it came pre installed on this comp ( bought it as a whole :/ ). Will I still be able to use this windows if I use another motherboard or will I have to buy a new copy?

Games I play : WoW, LoL, SC2, Skyrim, BF3 and whatever else comes out.

So, basically, I'd like to take advantage of the black friday deals and build a gaming rig that can run most games ( it's probably not going to get ultra right? ) at high with decent fps ( will it be able to do that also? ). I really appreciate any help and if you read all of this. Thank you so much.



Edit : Tried making one but it's a little over. I could downgrade to a 660 ti easily though.

PCPartPicker part list: http://pcpartpicker.com/p/orFJ
Price breakdown by merchant: http://pcpartpicker.com/p/orFJ/by_merchant/
Benchmarks: http://pcpartpicker.com/p/orFJ/benchmarks/

CPU: AMD Phenom II X4 955 Black 3.2GHz Quad-Core Processor ($82.99 @ SuperBiiz)
Motherboard: Asus M4A87TD/USB3 ATX AM3 Motherboard ($104.46 @ NCIX US)
Memory: Kingston Blu 8GB (2 x 4GB) DDR3-1600 Memory ($29.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($69.99 @ NCIX US)
Video Card: EVGA GeForce GTX 670 2GB Video Card ($369.99 @ Newegg)
Case: Cooler Master Storm Scout ATX Mid Tower Case ($64.98 @ Amazon)
Power Supply: Cooler Master GX 650W 80 PLUS Certified ATX12V Power Supply ($66.49 @ SuperBiiz)
Optical Drive: Sony AD-7280S-0B DVD/CD Writer ($18.99 @ Newegg)
Total: $805.88
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-11-20 01:29 EST-0500)



Edit 2 : It seems I have to buy a windows 7 copy, so I tried to make this one, and it's basically in the price range.

PCPartPicker part list: http://pcpartpicker.com/p/ourb
Price breakdown by merchant: http://pcpartpicker.com/p/ourb/by_merchant/
Benchmarks: http://pcpartpicker.com/p/ourb/benchmarks/

CPU: AMD Phenom II X4 955 Black 3.2GHz Quad-Core Processor ($82.99 @ SuperBiiz)
Motherboard: Asus M4A87TD/USB3 ATX AM3 Motherboard ($104.46 @ NCIX US)
Memory: Kingston Blu 8GB (2 x 4GB) DDR3-1600 Memory ($29.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($69.99 @ NCIX US)
Video Card: MSI Radeon HD 7870 2GB Video Card ($244.99 @ Newegg)
Case: Cooler Master Storm Scout ATX Mid Tower Case ($64.98 @ Amazon)
Power Supply: Cooler Master GX 650W 80 PLUS Certified ATX12V Power Supply ($66.49 @ SuperBiiz)
Optical Drive: Sony AD-7280S-0B DVD/CD Writer ($18.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit) ($91.99 @ Amazon)
Total: $774.87
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-11-20 12:54 EST-0500)

Looks ok to me.
The only part I would strongly object to is the PSU, as the Cooler Master GX series is not that good, you can certainly get better PSUs for the money. Also you don't need as much as 650W, unless you're going to Crossfire/SLI in the future.

Rosewill Capstone-450 ($60 @ Amazon)
http://pcpartpicker.com/part/rosewill-power-supply-capstone450
Or
Rosewill Hive-550 ($66 @ Amazon)
http://pcpartpicker.com/part/rosewill-power-supply-hive550

If you are going to CF/SLI then this is $10 more expensive before rebate and is much better:
XFX ProSeries 650W Core Edition ($75 @ NCIX)
http://pcpartpicker.com/part/xfx-power-supply-p1650snlb9

I think this is a better motherboard:
Asus M5A97 R2.0 ($90 @ Amazon)
http://pcpartpicker.com/part/asus-motherboard-m5a97r20
Functionally, very similar to the Asus M4A87TD/USB3, but is cheaper, has an internal USB 3.0 connector, so you could buy a case that has two USB 3.0 ports on the front panel and use them easily.
The only thing is missing compared to the M4A87TD/USB3 is an IDE port, so if you need that, then you might as well stick with it.

If you are going to CF/SLI in the future then it is preferable to get a motherboard with either an x8, x8 split or an x16, x16 split, rather than an x16, x4 split, like on the two above.