I doubt he'll need such a powerful video card though. Since he won't be playing high demand games, you could get away with something smaller. This isn't my area of expertise, but I'm guessing something like a 6850 would do (which could easily be overdoing it for just movies/photoshop).
The GPU might be a bit of overkill since you aren't gaming, but you have plenty of budget to work with... You could drop the costs by going with a 500GB hard drive and using the onboard video (subtract about $200 off the total below).
Figured I'd buff it up as much as I could with that kind of budget, fast CPU, good SSD for fast boot/OS operation/photoshop, nice case, and a video card to handle the stress of high resolution. Total: $1396
FYI, I couldn't find a 27 in + monitor with that resolution (1920x1200) on newegg...