My HP Pavilion is 4-5 years old now and generally does a good job, the problem is it overheats in hot weather when sending video to the TV via HDMI cable.
It also breaks up if the video is too large a file size.. eg 3-4gb HD movie even though I upgraded the memory.
I've tried all the tricks, it sits on a little cooling pad, gets cleaned regularly etc.
So I'm thinking of replacing it, it doesn't have to be anything special, just run a bit cooler under a heavy workload.
Something around USD700.