Okay here's the deal, I was looking at powerbooks but I've decided that I've had enough of laptops for a while and I'd rather put the money into something that I will be able to get some great performance from. So I've got a choice of G5 Dual and upgrade it or build my own Dual processor PC. Something I'm not sure about is can I do an aftermarket upgrade of the G5s processors or is it not possible like other G5 apples? If it was possible I'd just go the PC route with it's upgradablity and use Tiger OS but that's not a possibility(Although I could use mods to give windows an apple theme I suppose). So, I'm looking for opinions and whether you think I should side with apple's software or the pc's upgradability. Thanks for any help.