Is this a good gaming build, can anyone suggest something else

spend less on the RAM. cheapest 2x4gb DDR3-1600 with a CAS latency of 9 and you're set to go.

i'd go find a better PSU brand than that. something from Corsair, Seasonic, Antec, or XFX are highly recommended;
http://www.eggxpert.com/forums/thread/323050.aspx
aim for Tier 3 at worst.

optionally; feel free to drop down to an Z77 Extreme4 or Extreme3 if you're looking to save up and/or spend it elsewhere.

do you have a boot/storage drive in mind?

Im doing to cannibalize the drives from my other computer

I wanted to overclock so I thought the extra phases on the 6 would be worth it

I have about 70 dollars what psu would you recommend

everything is good in this Rig..

Do NOT - repeat do NOT purchase that case or power supply. Raidmax is a brand that has a very horrible reputation and makes a lot of crappy products. That case will fall apart on you within a year. With a Cool Max power supply you might as well put a TNT detonator on your PC.  

This would be a far better use of $875:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($219.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.99 @ Newegg)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($134.99 @ Newegg)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Newegg)
Video Card: PowerColor Radeon HD 7870 XT 2GB Video Card ($239.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: PC Power & Cooling Silencer MK III 500W 80 PLUS Bronze Certified ATX12V Power Supply ($69.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($15.99 @ Newegg)
Total: $825.92
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-03-18 00:19 EDT-0400)

I really hate Raidmax. I've used cases on a few work builds and they're very cheaply made and have really poor quality parts and cut corners on construction. They fall apart within a year and you'll wind up replacing them. They are not fine by any stretch of the imagination.

thanks for all the help i will defiantly change the psu and maybe the case