Advice on Computer Build

This is looking like it'll be brought forward a month - my current PC has decided it's had enough. Everything I've tried so far has failed. I'm going to put all the original components back in in a bit (old graphics card, take the extra RAM out), and if that doesn't work, then I'll need to take a hard drive with a Windows installation out of one of the other computers around the house and stick it in. Obviously if that doesn't work, I'm buggered, and so the new build will go straight ahead.

And hurry up with your pics, !K_A!! I want to see this sexy beast of yours.