How can I improve this system? Thanks

This is my proposed first build. Have a look and tell me where I can improve.

Case – Antec 900
http://www.antec.com/us/productDet [...] odID=15900
I think this is a pretty decent case. Looks pretty good as well.

PSU – Antec NeoPower 650 Blue
http://www.antec.com/us/productDet [...] odID=28651
Have not spent too much time looking for a PSU, but this seems adequate.

Motherboard – Asus Striker II Formula
http://uk.asus.com/products.aspx?l [...] odelmenu=1
Decided to go for this so then in the future I can always get another graphics card. I think Asus are good as well.

CPU – Intel Core 2 Quad Q9450
http://www.intel.com/products/proc [...] /index.htm
Not really planning on OCing so this seems like a nice processor.

Graphics card – Asus EN8800GT TOP/G/HTDP/512M
http://uk.asus.com/products.aspx?l [...] odelmenu=1
I heard this is a good 'bang for buck' GPU.

RAM – OCZ PC2-8500 Reaper HPC 4Gb
http://www.ocztechnology.com/produ [...] gb_edition

Hard Drive – Seagate ST3320620A 320Gb
http://www.wdc.com/en/products/pro [...] riveid=459

Optical Drive – Pioneer DVR-212BK
http://www.pioneer.co.uk/uk/produc [...] index.html

Thanks for looking!

Hang on let me Edit it