Personally i wouldn't buy it..

For the same price you could get a REALLY nice 64Bit AMD System.. which are ALOT more powerful than the pentium 4's, even the extremes.. and they will play games alot better..

Your graphics card is a PCI-E Nvidia Ge-Force 6600 Standard 128mb card however they've overclocked it slightly so they call it a "6610"..

Personally i would have alook at these systems:
http://www.meshcomputers.com/updated/essential_64_1.htm

Mesh i have used before for friends e.t.c and they are REALLY very good, all you would need to do to that system is to change the graphics card to a 6800LE or 9800Pro..

and max price is £785 if u go for 9800Pro thats around the same as your 6610 card u had with that system and its still for around £715

Seriously PAY THE EXTRA!!! if u dont have the cash at the moment, save until later this xmas.. and order..

The 939Pin 64Bit is the latest in the 64Bit Amd range and its what they are sticking with... and its a really good system..

Just really don't bother going for a Pentium 4, theres a big debate, and fair enough your 64Bit 3500+ (which is what that machine comes with) only runs at an actual speed of 2.2ghz i think but it will beat your pentium 4 u were thinking of getting in most tests by about 10-20% if not more..

and its 64bit so your ready to take on the new line of 64bit games / programs and use the newest and latest