Hello, I'm beginning a project of building a computer for gaming. My aim is to be able to run most of todays games smoothly on average settings, as I am not too fussed about quality, I am instead fussed about smooth and fast gameplay. Here is what I have in mind, I am trying to keep the cost down. Can anybody please recommend any changes to my setup, an appropriate graphics card and power supply, thankyou very much.

MOTHERBOARD - "http://www.play.com/PC/PCs/4-/7836141/ASUS-M2N68-VM-Socket-AM2+-GeForce-7050PV-Micro-ATX-Motherboard/Product.html"
Model: ASUS M2N68-VM (Socket AM2+)
Form: Micro ATX
Compatible Processors: Athlon 64, Athlon 64 FX, Athlon 64 X2, Athlon X2, Phenom X4, Phenom FX, Phenom X3 (64-Bit Support)
RAM: 4x 240pin DDR2-1066/800/667/533 DIMMs, Dual Channel, ECC/non-ECC, un-buffered, Upto 8GB
Storage Controller: ATA-133, Serial ATA-300, eSATA port
Storage Ports Configuration: 1 x ATA, 3 x SATA, 1 x eSATA
FSB: 1000MHz

PROCESSOR (CPU) - "http://www.overclockers.co.uk/showproduct.php?prodid=CP-234-AM"
Model: AMD Athlon 64 X2 Dual Core 7750+ Black Edition 2.70GHz.

Would like help here, unsure about this --> RAM (MEMORY) - "http://crucial.com/uk/store/mpartspecs.aspx?mtbpoid=5B15D111A5CA7304"
Get four of these!
Type: 1GB, 240-pin DIMM, DDR2 PC2-5300 memory module
Module Size: 1GB
Package: 240-pin DIMM
Specs: DDR2 PC2-5300 • CL=5 • Unbuffered • ECC • DDR2-667 • 1.8V • 128Meg x 72 •

HARD DRIVE - "http://www.overclockers.co.uk/showproduct.php?prodid=HD-011-FJ"
Model: Fujitsu 160GB 5400RPM SATA 8MB Cache - OEM (MHY2160BH)
Capacity: 160GB
Cache: 8MB
Interface: SATA
Spin Speed: 5400RPM
Seek Time: 12.0ms

GRAPHICS CARD - undecided

POWER SUPPLY - undecided

Thanks again!