Remember that minecraft is ram dependent. this build is an APU, Meaning it has a hybrid gpu/cpu so you can even play bf3 without the need of a dedicated graphics card on low/medium present games.. and some games on high settings. and later if you can, buy an additional 7750 and it is crossfire compatible with that apu and you can play modern games even high/ultra settings on 780p.
If you are really on a tight budget then ask somebody if they have a free copy of windows
even on internet you can find one but its up to you. you can get -80$ less on your budget build.
PCPartPicker part list:
http://pcpartpicker.com/p/2acu9
CPU: AMD A10-6800K 4.1GHz Quad-Core Processor ($119.99 @ Amazon)
Motherboard: Gigabyte GA-F2A55M-HD2 Micro ATX FM2 Motherboard ($42.99 @ Newegg)
Memory: Mushkin Silverline 8GB (2 x 4GB) DDR3-1600 Memory ($74.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($58.98 @ OutletPC)
Case: Raidmax ATX-249B (Black) ATX Mid Tower Case ($19.99 @ Newegg)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($19.99 @ Microcenter)
Optical Drive: Asus DRW-24F1ST DVD/CD Writer ($15.98 @ OutletPC)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($79.99 @ Newegg)
Total: $432.90
http://www.youtube.com/watch?v=ygbDLwHbhfw
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