I am a digital photographer, I am trying to decide between the AMD Phenom II x4 945 vs the Intel I7 920 processors. Seems to be a $200.00 price difference, not sure if it is worth the extra? These are both from Dell.
The Phenom II is a very capable CPU, and the i7 is a beast.
The i7 might be overkill for you, but would have the extra power to carry you for a few extra years down the road, its up to you.
If I were you, i7 920 all the way.
If all your doing is editing photos professional grade, the i7 860 should be an overall cheaper choice than the 920. Performance would be equal or even a touch better. I'd also get the i5 750 before the AMD for your usage and they would be close to the same price.