Gigabyte GA-MA785GT and Sapphire 4870 worth building

[DotNetUser]

I wanted to know if the configuration I got was homogeneous and there were no problems between the various components:

Antec Two hundred
Psu: Fortron FSP600-80GLN 600W GREEN POWER
Gigabyte GA-MA785GT-UD3H
AMD Phenom X3 II 720 BE
4GB Crucial Ballistix (2x 2 GB) DDR3-SDRAM PC10600 CL9 (will be buying)
WD Caviar Blue 500gb
Samsung SH223B/BEBE-DVD
Graphics Card: Sapphire 4870 Vapor-x 1 GB (will be buying)

It will be for playing games like World In Conflict, COD4, Dawn of War 1 & 2. Is a config of Gigabyte GA-MA785GT-UD3H motherboard and Sapphire 4870 graphics card worth building?

[AmdUser]

If you want to add a graphics card, why not you take a motherboard with integrated video chipset? Take something like a GA-MA770T-UD3P better result for the same performance / price. And the WD Caviar Blue hdd of 640 GB is a bit better.

[DotNetUser]

It has an AMD chipset that is newer than the 770T-UD3P, and which is more recent? I do not know if it brings something extra. I also thought of changing few things just to see if everything is correct and to have some opinions. I changed my power supply to Corsair VX550W. Also what is the difference between Crucial Ballistix 4GB and Crucial 4GB (2x 2 GB) ram?

[AmdUser]

Regarding motherboard, yes it supports more connectivity. Regarding difference between Crucial Ballistix 4GB and Crucial 4GB (2x 2 GB) ram, there is not much difference. In fact Ballistix RAM's are made for overclocking.