Your money always buys more if you can wait and the rumor is that a newer case design is coming next year. That along with some other updates may or may not lower MBP operating temperatures. So if you can wait and want to wait, there is a chance that the heat issue that concerns you will be diminished in the 2012 MBP refresh.
If I were concerned about MBP heat and needed a MBP for school before the 2012 refresh, I might buy the 2011 MBP 13 because it should runs cooler and I would definitely be using smcFan Control to selectively increase the fan speed for potentially higher heat functions.
I like how smcFan Control allows me to crank up the fans when I know I'm going to be doing something that would otherwise push the upper limit of operating temps on my 2010 i5 MBP.
If I were concerned about MBP heat and needed a MBP for school before the 2012 refresh, I might buy the 2011 MBP 13 because it should runs cooler and I would definitely be using smcFan Control to selectively increase the fan speed for potentially higher heat functions.
I like how smcFan Control allows me to crank up the fans when I know I'm going to be doing something that would otherwise push the upper limit of operating temps on my 2010 i5 MBP.