Definitely go intel, i have and never had a problem. AMD may be cheaper and better for games, but yes, Intel does so much better with doing different things at once (like background rendering in editing). Image editing doesn't require much, I used a 1 ghz computer and had no problem with images, but editing, ya gotta go more than 2 ghz. One more bit of advice: do NOT get a celeron for editing, get a p4 at least 2 ghz.
Asus P4P 800-E Deluxe, Intel P4 3.0 GHz
1GB RAM, ATI Radeon X1300 pro 256 mb
20GB maxtor, 250GB western digital