The iMac, now that it can take 8GB, is worth a look as a photographer’s workstation. It’s still limited in terms of memory and storage capacity/speed but it’s a nice compact unit with plenty of CPU “grunt” for many tasks (but see my application multi-core report card). Your main issue with an iMac is the lack of expandable, redundant and high speed storage eg RAID. For some users, Firewire 800 externally may suffice. but this is one reason to consider a MacBook Pro for its ExpressCard slot, which can accept an eSATA card, the only way to expand to high-speed external storage.