I've been considering getting a new Mac mini and finally retiring my eight year old Power Mac 2.0 GHz G5 dualie. About time huh? I'm not 100% set on the mini, I'm also considering an i5 iMac - either a 21.5" or a 27". Does the 21.5" run warmer than the 27"? I assume its internals are the same as the 27" but more tightly configured. Just wondering.