Personally, I would have thought that anything that deals with HD video would want as much bandwidth as it could get, but since you can get TV tuners for USB, that probably isn't the case. PCI can transmit four times as much bandwidth as USB. Overclocking your CPU is nice, and I see no harm in doing it up to the point where you don't need to increase VCore. You should be able to change your RAM multiplier to keep the memory speed close to what it's rated at. The 8500GT is much better than the 7300LE, so yeah, that seems like a fair deal to me.