I am not sure what you are saying is correct, because if i was to go c2d now, i would be limited to very cheap components only being able to scratch together around £200 for my current components, so gaming performance would not be that far ahead of what i currently have. I'm probably going to stick with this for a while longer because theres no point in upgrading with soo much new hardware coming out daily, plus I have no problem with my system, its just bit laggy in desktop, im not a crysis fanboy so most games run perfect, and I have a small monitor. I guess I should think about forking out for an 939 dual core and overclocking to the extreme.
You need a new board, cpu and RAM. Your GFX card is fine as are all the rest.
You would also need a new install of WinXP , plus licence issues if you on OEM.
If you went for cheap components, 2GB of RAM will cost around 40 quid at max, a P35 based motherboard can be had for around 70 and that leaves you with 90-100 for a new CPU. If you wait for the Intel price cuts around 20 April, I'm pretty sure you could pick up a e6xxx series for around that.
http://www.overclockers.co.uk/showproduct.php?prodid=MB-000-OK £70-49
http://www.overclockers.co.uk/showproduct.php?prodid=CP-158-IN&groupid=701&catid=6&subcat=793 £111-69
http://www.overclockers.co.uk/showproduct.php?prodid=MY-108-CS&groupid=701&catid=8&subcat=813 £35-24
Total : £217-42 plus delivery at current prices.
Of course you could stick with your original idea and only spend 60-80 on a x2 4400/4600 etc
