I am going to build an i7 gaming rig and want advice

. Please feel free to give suggestions.
Budget: Rs.55,000~ Rs.60,000
Processor:i7 920
ori7 930 (
please suggest)
Motherboard:Gigabyte ex58 ud5
or Gigabyte ex58 ud7 (
please suggest)
Ram:Kingston
or Corsair 4x1 1333 mhz
Graphics Card:XFX Radeon HD 5850 1GB GDDR5
Case:HAF 922
I cannot find a suitable power supply as I don't know how much power it will require.
Please suggest a suitable power supply
.
I already have a computer which I am upgrading so there is not need for UPS, Keyboard,etc.