I am thinking of getting either the new 21.5Ghz iMac or the new 13" 2.3Ghz MacBook Pro. Although I don't really need a laptop, it would be nice if I were to go on a trip and take it with me, other than that I don't really need one. My main question is besides the iMac being a Quad-Core, is the difference is speed much greater? I do a lot of HD video encoding, photoshop and streaming. Will the entry level MacBook Pro be able to keep up with the tasks? Would the encoding be much faster on the iMac? Thanks in advance.