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For about a year I've have a 320Gb 5400rpm SATA laptop drive (about $140) in an external USB SATA case (about $30). It doesn't get particularly hot. The 3.5" SATA in it's USB case gets a lot hotter.
Have you considered doing the same and only keeping the o/s and programs on the internal disk??
The 7200s are a bit warmer than 5400s but not a huge amount.
To an extent it comes down to how much space you really need, and how fast you want it to be. And how much you are prepared to spend.
SSD blindingly fast.
7200rpm quick but a bit warmer
5400rpm speed ok
4200rpm slow but quiet and cooler
But you should also remember laptops are easier to steal and subject to many more knocks, so every Gb of disk needs to be backed up somewhere.
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