My First PC Build - Suggestions?

Hello!

I have never built a computer but have been researching the ins and outs of what will be involved and now feel fairly confident to order the parts.

I am a casual gamer but still want a decent amount of bang for my buck.

I would really appreciate any suggestions, recommendations or improvements to the following build:


CPU: AMD Phenom II X4 965 Black Edition, S AM3, 3.4GHz, 8MB Cache, 125W, Retail

GPU: 1GB Asus HD 6850 DirectCU, 4000MHz GDDR5, GPU 790MHz, 960 Stream Processors, 2x DVI/ HDMI/ DP

RAM: 4GB (2x2GB) Corsair DDR3 XMS3 Classic, PC3-10666 (1333), Non-ECC Unbuffered, CAS 9-9-9-24, 1.50V

MOBO: Asus M5A78L-M/USB3, AMD 760G, S AM3+, DDR3, SATA II - 3Gb/s, RAID SATA, PCIe (x16), Graphics On Board, mATX

Hard Drive: 500GB Hitachi 0F10381 Deskstar 7K1000.C, SATA 3Gb/s, 7200rpm, 16MB Cache, 8.5ms

Case: Coolermaster Elite 335U Black Mini Tower Case with Rear 120mm Fan w/o PSU

PSU: 430W PSU, Corsair Builder Series CMPSU-430CXV2UK, 80% Eff', Uncertified, Quiet Fan, ATX v2.3

OS: Microsoft Windows 7 Home Premium 64 Bit SP1, Operating System, Single, - OEM

Disk Drive: Samsung SH-D163C Black, 48x CD-ROM 16x DVD-ROM, SATA, OEM


The disk drive, case, power supply unit and hard drive were selected somewhat carelessly. I understand the 7200rpm will give faster access. Corsair appear to be a reputable make and offer +80% efficiency with the PSU and seem to be popular - although I have concerns that 430W will be sufficient.

Thanks