I just received this PM from a newbie called Analyze:
"I saw your gaming PC thread,since I am a newbie I am PM'ing you.
Don't get the P45 motherboard.It has crossfire with two PCI-E 16x slots at 8x+8x.So if you want to upgrade your PC with another ATI 4850 then it will not run to its full potential.
Instead get an X38/X48 based motherboard.they do crossfire at 16x+16x."
Just looked this up and it's true, so it's very useful indeed!
I'll be getting a Gigabyte X48 motherboard rather than the Asus one. It's forty pounds more, but I won't be getting the sound card after all, so it only works out at about twelve pounds more.
And since it'll mean I get much more out of my graphics cards then I'll definitely be doing it