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Hey, I'm kinda in the same position and asked around for this. I'm used to 17" screen right now and been able to play around with a cMBP 15" and 17" to 15" ain't that bad.

For your case, using photoshop a lot, I think it's better to go for the 15" rMBP. The great screen, big resolution and good graphical processor is a thumbs up for the rMBP I think.

I'm buying a new rMBP next month myself so till then (quite long :p ) I can't say how it is.
 
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