im on a g4 powerbook 15inch screen. i woulnt go for anything smaller then the 15inch. with the 17inch you can see the whole of logic on the screen. the 15inch aint bad. you dont miss alot of the screen. i think mines 1.5ghz. not sure but the 17 might be abit more powerful. you'd hav to check it out.

g5 power book. bet thats nice!