Originally Posted by DeadiKation

As for current case and Power Supply, I gave the whole computer I had before to my little brother, A completely new build.

I'll look into that actually, For now though I'm thinking about this build

Current Build in Mind

AMD Phenom II X4 955 Black 3.2GHz Quad-Core Processor
Cooler Master Hyper N520 43.8 CFM Sleeve Bearing CPU Cooler
Asus M4A88T-M Micro ATX AM3 Motherboard
Patriot Intel Extreme Master, Limited Ed 8GB (2 x 4GB) DDR3-1600 Memory
Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive
XFX Radeon HD 6870 1GB Video Card
Apevia X-Plorer2 Black/Red ATX Mid Tower Case
CoolMax 600W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply
Samsung SH-224BB DVD/CD Writer

That or this build

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i3-3220 3.3GHz Dual-Core Processor ($119.99 @ Newegg)
Motherboard: MSI B75A-G43 ATX LGA1155 Motherboard ($79.99 @ Newegg)
Memory: GeIL Pristine 8GB (2 x 4GB) DDR3-1333 Memory ($30.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($69.99 @ Newegg)
Video Card: Gigabyte Radeon HD 7850 1GB Video Card ($174.99 @ Newegg)
Case: Gigabyte GZ-P5HB5C (Black) ATX Mid Tower Case ($32.98 @ Newegg)
Power Supply: Antec Neo Eco 400W 80 PLUS Certified ATX12V / EPS12V Power Supply ($44.98 @ Newegg)
Optical Drive: Samsung SH-224BB DVD/CD Writer ($15.99 @ Newegg)
Total: $569.90
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-05 19:54 EST-0500)

A 400W will not be enough for a 7850. I can guarantee that. You want to be very careful about who you buy a PSU from; I recommend SeaSonic since they're one of few brands that actually manufacture their PSU's themselves (sorry to say Corsair doesn't) and they use top quality components.