Sorry if I didn't word that right, I meant my overall budget is £500. Unsure of what motherboard to build from though, I've been looking at the "Intel LGA1156 (P55 Chipset) - SATA 3Gb/s" models because everything above that looks a bit pricey.
PC will be used for gaming mostly, moderate resolutions, L4D2 mostly, but maybe some bad company 2.
AHHHH.
Do you just want a tower and operating system?
I would go with a 955BE build the AMD mobo is quite a lot cheaper and is about as good as the i5 one.