You're right on the money with this build. I wouldn't do much different.
For the mobo, the main difference for you between the UP4 and the D3H is Thunderbolt. It's a high speed interface kinda like USB or Firewire that's supposed to be the next big thing. TBH, I don't think you'll really need it for photo editing. The main thing I see it being useful for is for editing videos where you'd have an external Thunderbolt drive being used to store videos and videos being edited directly off the drive. I'd go with the UD3H these days though. It's like $5 more, but it has higher quality components such as thicker copper.
Amazon.com: Gigabyte Intel Z77 LGA 1155 AMD CrossFireX/NVIDIA SLI W/ HDMI,DVI,DispayPort Dual UEFI BIOS ATX Motherboard GA-Z77X-UD3H: Computers & Accessories
As for memory, I think 8GB will be sufficient and you could always upgrade to 16GB. That's why I suggest picking up some really common memory such as the Vengeance since it doesn't seem like Corsair will be discontinuing that anytime soon. Of course, if you have the budget, just go with 16GB from the start and not have to worry about anything down the road. Just curious, but what kind of camera are you using? If you're like me and you've got a Nikon D800 that produces 50MB raw files, you may want to go with 16GB from the start since 8GB gets eaten up after a hundred or so photos.
For the graphics card, that GTX 650 Ti is good. Does it fit in the budget?
For the SSD, I think the Samsung 840 Pro is the best of the bunch right now. The Crucial m4 is slow, but it's cost effective if you need to save a couple bucks.
For the PSU, you can just go with the Antec VP-450. Great power supply and it's cost effective. You don't need 600w with a GTX 650 Ti.
Amazon.com: Antec VP-450 450 Watt Energy Star Certified Power Supply: Electronics