I have put in an order for the 15" i7, and am having it reconfigured at OWC: replacing the optical bay with a 100GB SSD for boot/application, and a 1TB HDD for data, and with 8GB of RAM. That should be serious computing power (for Photoshop anyway). One can then add a large monitor and a RAID external storage unit as backup.[/url]
This is also basically what I intend to do, when SSD prices come down, and their storage size goes up.