Thanks grieve. I knew someone would say something about the power supply. I'll also take a look at getting a better heatsink. Is the video card OK? Should I get a cheaper video card and a separate TV tuner card? I think the video card will require quite a bit of power, but it seems like a nice card.
Ram is OVERKILL. Your Processor won't allow you to overclock enough to really require 1066. 800mhz is Ideal.
Consider a different CPU cooler. Artic Freezer 7 if your on a budget, or maybe a Tunq Tower for a litte more.
the Graphics card is fine, I would personaly go 8800GTS, but this is more my personal pref. Likewise with the 650i chipset MoBo. I would prolly not go Nvidia chipset, but again this isn't a big detail,, somepeople like em.. I dont