I have the iMac g5 20 inch 2ghz 1.5 gig mem 128 meg graphics card 250 gig hd wireless keyboard and mouse. I have the one that doesn't have the isight builtin to it. Anyways someone wants to trade me a powerbook g4 15 inch same specs on the apple site for my machine.. Is this a pretty good deal? I want to go portable do you think that this would be a good trade? Let me know! Thanks!