hi! i am from India and i recently assembled my own gaming rig for Rs 50,000 which roughly comes to ur budget in USD.
Processor - i5 2500k
Mobo - Intel DH67BL
GPU - Asus nvidia gtx 560ti
Ram - 2 x G.Skill NT 4gb
HDD - 1tb Seagate barracuda 7200rpm
Optical Drive - Asus DRW-24B3ST
PSU - Seasonic S12 II 520W
Cabinet - Cooler Master Elite 311
It is working extremely fine for me! able to play all games on 1080p resolution smoothly.
The mobo is a micro atx one, if u want u can go for an atx one which will give you more room.
Also you can go for the Cooler Master elite 311 plus for the cabinet as it has front usb 3.0 ports and a transparent window on the side which looks cool!
I am getting extremely high ratings on windows 7 performance info and tools.