So, I don't know much about mining, but I do know that my 21.5" iMac has the capability to GPU mine-
http://www.apple.com/imac/specs.html(the $1200 one)
Is it worth it to GPU/CPU mine on it? Also, will I see a spike in my electricity bill because of it?
I'm mining using mining.bitcoin.cz
the 1200 dollar model has a 6750.. i think that gets you about a 1/10 of a btc per day
the 2000 dollar modal has a 6970.. that will get you about .25 btc per day