Mobile CPU's and Summer Heat

I was wondering if it might not be better to get a duron or celeron processor for a laptop rather than an Athlon or Pentium 3/4. I want to buy a laptop and expect to work outside on the deck, coffee shop, etc. It will not be in an air conditioned environment. Given that both the Athlon and P4 run quite hot, I was wondering if it would be a good idea. Otherwise, I expect that the processor would be prone to overheating and shutting down or throtling back frequently. I do have a desktop so, although I would like to be able to play games on my computer. . .it isn't a requirement. Otherwise I would just expect to do office apps on the laptop and some statistical number crunching.

you might look into a dell computer, their cooling is suppose to be very well designed, my friend purchased a toshiba and it overheats like crazy when he plays games for extended periods of time.