CPU: Intel® Core™ i7-2600 Processor 8M Cache, up to 3.80 GHz
Motherboard: Gigabyte GA-P67A-UD3R-B3
RAM: 16 GB DDR3 Corsair Vengeance BUS 1600 V 1.5
HDD-1: Western Digital 1TB Black Edition SATA-3 6 GB/S
HDD-2: Western Digital 640GB Blue Edition SATA-2 3 GB/S
HDD-3: (Optional) in case i connect a friend HDD to copy some data
VGA: Sapphire ATI Radeon HD 5870 1GB DDR5
Case: Thermaltake Overseer RX-I
Keyboard & Mouse: Microsoft Optical Desktop 1000
External-HDD: (Optional) I have two external HDD and i use them from time to time plus my USB 3 FlashMem
Kindly note: i am currently using 500w ASUS P-50GA and it's working perfect but on another old case (Gamma) and never test that PSU with my new case (Thermaltake) but i think it's time to upgrade my PSU because i am using it for 3 years and a half till now
1st question: how much do i need to run this specs ?
2nd question: if my 1st question answer is between 500/600 like i expect kindly find below list of all power supply available in my country and i appreciate you guys pick one or two as best of them
CORSAIR TX650 V2 80 PLUS Bronze PSU
CORSAIR CX600 V2 80 PLUS PSU
CORSAIR CX500 V2 80 PLUS PSU
I have the modular version of the Seasonic S12II - awesome PSU and sufficient for your PC. The Corsair TX650V2 is a great PSU...also made by Seasonic and is more than enough for your PC. That XFX is also a great PSU...also made by Seasonic. Get the least expensive of those three and be happy with a great PSU.
Stay away from Coolermast Extreme Power PSUs - they are complete trash. Also stay away from those HECs. The only Thermaltake that I would even consider is the TR2, but only if I couldn't get one of the above I recommended.