OK - I see what you are saying .
Next - have you done the calculations - cost of nice new shiny iMac [ or better :P ] against AlanH's siggestion of a nice big screen and keyboard +/- rodent ?
And how much do you reckon you will get for your MacBook.
Even with your Educational Discount [ I think you mentioned that some time back ] can you really afford the changeover ?
If you went with the suggestion of the Screen etc , you would really get the best of both worlds.
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If a thing ain't broke --- DON'T FIX IT
Experienced in making a mess of things

C2D MacBook on OSX 10.5.6 ,Lynksys Router WRT54G ,G3iMac DV400, OSX 10.3.9 [ sssh and a PC using Doze XP Home :( and now a PC wireless lappy using XP Pro ] all on
Virginmedia 10mbit