800$ Gaming PC Build

No you wouldn't need a different case i have a few builds so here one idea PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-2400 3.1GHz Quad-Core Processor ($189.99 @ Newegg)
Motherboard: ASRock Z68 Extreme3 Gen3 ATX LGA1155 Motherboard ($114.99 @ Newegg)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($46.99 @ Newegg)
Hard Drive: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($89.99 @ Newegg)
Video Card: MSI Radeon HD 7850 2GB Video Card ($267.55 @ Newegg)
Power Supply: XFX 550W ATX12V / EPS12V Power Supply ($80.98 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.99 @ Newegg)
Total: $807.48
(Prices include shipping and discounts when available.)
(Generated by PCPartPicker 2012-06-14 05:07 EDT-0400)

Here's a build suggestion almost the same as bigcyco1 but with a slightly better GPU:

GPU: $320- XFX Radeon 7870

CPU & Optical Drive: $196- i5-2400 & Asus

PSU & RAM: $95- Corsair CX500 & Corsair Vengeance 8GB

Motherboard & HDD: $200- Asrock Z77 Pro4 & Samsung Spinpoint 1TB

Total(Excluding Rebates): 812 USD

Rebates: $30

If you intend to buy an SSD, while keeping it within the budget, do the following:
1. Downgrade the GPU to Sapphire Radeon 7850. Save $70.
2. Downgrade the Motherboard/HDD combo to Biostar TZ77B/1TB worth $180. Save $20.

That should save money to buy a good 128GB SSD like : Mushkin Enhanced Chronos worth $95

Here's a rel. comparison between the performance between 7850 and 7870.

Mobo + HDD:$189.98
ASRock Z77 Extreme4 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

bundled with:

1x SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM SATA ...
http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...

CPU:Intel Core i5-3570K Ivy Bridge 3.4GHz (3.8GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I53570K $239.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


ODD:LG DVD Burner 24X DVD+R 8X DVD+RW 8X DVD+R DL 24X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM Black SATA Model GH24NS90 - OEM $17.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

RAM:G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL $46.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

PSU:CORSAIR Builder Series CX600 V2 600W ATX12V v2.3 80 PLUS Certified Active PFC Power Supply $69.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


GPU:ASUS HD7850-DC2-2GD5 Radeon HD 7850 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card $259.99

Free DirtShowdown coupon w/purchase, limited offer
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I left the option to overclock in case you change your mind at a later date comes out to roughly around 825.00 you would need to add an aftermarket cooler if you do ever decide to overclock your CPU in re guard to z_4 build it is good but 7850 at $240-270 is a decent value not great but decent and if overclocked can outperform 7870 while sipping power. But the 7870 is priced to close to the 7950 and GTX 670, which both perform much better. In terms of price/performance, there's simply no contest there's no way on earth the 7870 is worth the extra money, there's not that much in it. Anyway, if you have any questions feel free to ask!  

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-2400 3.1GHz Quad-Core Processor ($189.99 @ Newegg)
Motherboard: Asus P8Z68-V LE ATX LGA1155 Motherboard ($132.99 @ Newegg)
Memory: Crucial Ballistix sport 8GB (2 x 4GB) DDR3-1600 Memory ($42.99 @ Newegg)
Hard Drive: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive ($74.99 @ Newegg)
Video Card: EVGA GeForce GTX 570 1.25GB Video Card ($259.99 @ Newegg)
Power Supply: Antec 650W ATX12V Power Supply ($79.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.99 @ Newegg)
Total: $797.93
(Prices include shipping and discounts when available.)
(Generated by PCPartPicker 2012-06-14 14:28 EDT-0400)

Thank you guys for the help! I ended up going with this stuff:

CPU: I5 3550
Motherboard: Asus P8Z68-V LE ATX LGA1155 Motherboard
PSU: CORSAIR|600W CMPSU-600CXV2
HD: 1TB|WD 7K 64M SATAIII WD1002FAEX
GPU: Sapphire 7850
Ram: Corsair 8GB Vengeance
ODD:LG DVD Burner 24X

Hopefully everything will run smoothly!!!
Thanks again!  

Best answer selected by andycan111.

cool man and no problem your very welcome!