to answer your question, TCR, I am just doing the research, this isn't for me. The person wants a laptop, and has ruled out a desktop even though I have made it clear that they can get twice the encoding power for half the price of a laptop..
Also, I know many of you here are all about the newest, next architecture or tock, but the person I'm looking around for is ONLY interested in an older laptop that can be had for half the new price, or less. I'm wondering about certain components to look for, certain models of laptops that have great video cards or chipsets, etc. for encoding. I know my ATI FireGL has some encoding features on the GPU, so maybe something like that in a laptop, like you've mentioned about CUDA and quicksync, to offload some of what the CPU has to do. I would look into a used Sager or something, but that is most likely out of the price range. We are talking $300-$500. Old is fine, as long as it's been well maintained so that reliability isn't an issue. A core 2 duo would be fast enough, but I would like to stay away from a used Dell for several reasons.