I watch Freeview HD, Sky and SD / HD videos on my HTPC. No major gaming at all. Win7MC x64
The stuff that would make a possible difference if upgraded is:
Asus P5Q-L main board
Intel Dual core E8400 3.0GHz CPU
Blackgold BTG3540 TV Tuner
Hauppauge PVR-150 MCE Edition
Asus EN9600GT-Silent Passive GPU
4GB Supertalent DDR2 800 RAM
Possibly graphics card would be first thing to upgrade but not sure if thats even necessary...
What are your thoughts?