If you are going to use it for games, then I would suggest the following changes: -
PROCESSOR: AMD Athlon 64 3500+ (939 pin)
MOB: Asus Deluxe GB Lan/1394/Sata/Raid Audio (939pin).
Also the Flat Panel is Analogue, whereas you want one with Digital and Analogue Input to get the best out of your Graphics Card, this card has DVI (Digital Video Intereface).
What you could do, is what I did with Mesh last month. Buy just the Base Unit upgraded where I have recommended, then buy an Iiyama 17" E435S Prolite separately. These can be purchased for as low as £199, PCWorld were selling them at that price.
If you go to the Mesh Site and select 'Build to Order' then you can select your configuration Base Unit without the Flat Panel.
As I said, I did this and it works great with games, the display is excellent with no ghosting.