Computer to play D3

[echoes1402]

Hi guys, this is my specs:

Recommended: Intel Core 2 Duo 2.4 GHz or AMD Athlon 64 X2 5600+ 2.8 GHz
You Have: AMD Athlon(tm) 64 Processor 3500+


RAM
Recommended: 2 GB
You Have: 2.1 GB


OS
Recommended: Windows Vista/Windows 7 (Latest Service Packs)
You Have: Microsoft Windows Vista Home Basic Edition Service Pack 1 (build 6001), 32-bit

Video Card
Recommended: NVIDIA GeForce 260 or ATI Radeon HD 4870 or better
You Have: ATI Radeon HD 4600 Series

My brother wants to run DiabloIII on a comp, he is thinking about buying a new computer but i want him to pay the less possible.
Should he buy a new computer? if it's the case, what do you guys suggest? (I gotta ship in Canada).
If he has to order some parts, what should he get???
Thx alot!

Math

 

[echoes1402]

His budget= 800$ MAX ...ty

 

[PCgamer81]

I would go with an i5 2500k, 4GB of dual channel DDR3, a good LGA1155 socket dual channel motherboard, Z68 preferably, an Antec EA Earthwatts 650, a 500GB HDD (not an SSD if all you are going to use it for is Diablo 3), and lastly a reference model AMD 7770. Those are the core essentials and would play D3 perfectly max settings in 1080p.