Privet I was in Minsk two years ago, and the year before that. My wife is from Zhodina. Better to get the parts in Russia or Ukraine and take them across the border.
But let's see what we can do here. I can't find the memory/RAM but you want DDR3 Dual Channel 1.5v 2x2GB or 2x4GB. Also I can't find the power supplies, but any decent 450w - 500w will run that system including that video card.
Hmm.. One of my friends bought a similar PC as this one a few days ago and he's now playing Crysis 2 at 85FPS.
Processor : Intel Core i3 2100 3.1Ghz - $125
Motherboard : Intel DH61WW or Asus Equivalent - $65
Graphics Card : Nvidia GTS 450 - $160
Hard Disk : Samsung Spinpoint F3 1TB - $55
Power Supply : Corsair CX430 - $45
Case : Your Choice - $50
Total : $450 before shipping charges and rebates.
You might want a MoBo with 4 RAM DIMMs. The person above posted a link to a ASRock product which has this feature. Make sure you buy a good MicroATX case which has many fan slots. My case has only two 80mm slots. Its a cheapo one.
The Corsair PSU is leagues above the Coolermaster, which is overrated junk. Do not buy any PSU today that has a little voltage switch on it, and doesn't have at least some level of 80+ certification for efficiency.
the i5-2400 s a great CPU, and better than the 2100.
I'll second the Corsair CX 500 as a better PSU. Coolermaster isn't quite the junk Diablotek is, but Corsair is top 5 quality.
go for 4 GB DDR3-1333/1600 or 8 GB if you can swing it for RAM. Get dual channel.