Your going to have a hard time finding a PDA that can use Photoshop (you maybe want to look into buying a netbook that runs Windows XP and get a good laptop webcam).
If you want a very decent PDA that when plugged into any computer looks like a flash drive (thus you only need photoshop on your desktop), then I suggest either the Nokia N800 or the Nokia N810. I have the N800 and have been using it for about a year now and I'm still finding awsome things to do on it. The camera is decent (I think around 2-3 MPx) though I'm sure you could find better. The N810 has a built in GPS. Both devices have wifi with Skype (for phone calls), FM Radio, plus it will run most Linux applications (including Gnome Office).
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