I build mine too. My current main home pc is used as a media centre. It's an Antec Fusion black case,
an Asus PM5-VL mobo
2x500gb hdd
Nvidia 9400gt passive cooled gpu
Creative xtreme music sound card
Hauppauge win nova-t 500 dual dv-b tuner
Hauppauge analogue tuner for Virgin cable
Intel core duo E4400 processor
LG Blu ray drive
Win 7 ultimate
4gb ram
I built it four years ago, bits of it, like the cpu are old hat now, but I dropped another 2gb of ram in this year & it's perked right up. Nothing like the satisfaction of building & running a pc for a few hundred quid that would cost a couple of thousand if you asked Mr. Packard, or Mr. Dell for the same spec.