I am not familiar with photoshops AMD support so the 4770K base would be my immediate recommendation. I like AMD but they have not been helping themselves in this regard.
Stock 4770K will be a good starting point, and get a decent board that will allow you to overclock in a couple of years when/if you find it necessary.
Mid range ASUS motherboard will give you reliability and BIOS controls that the OEM ASUS PC you listed most likely will not.
For the GPU, 760 is good, but if you need to save money somewhere that is where to do it. GPU performance offers diminishing returns much like faster RAM.
AMD discrete cards are not fully supported in the Master Suite the last I saw. So although the following review shows a 7750 performing almost the same as a 650, I am not sure which tests they ran in their benchmark.
http://www.pugetsystems.com/labs/articles/Adobe-Photoshop-CS6-GPU-Acceleration-161/
that website also shows that once you have enough memory, channels and speed make no difference. The file sizes you are going to work with tend to determeine how much RAM you need.
32GB of RAM is recommended for images that are 1GB in size!!!
http://www.pugetsystems.com/labs/articles/Adobe-Photoshop-CS6-Memory-Optimization-182/page4
With an 18 MP camera you are looking at RAW images of 25-30MB a piece. so even 8GB of mmeory should be plenty. However might as well start with 16GB, in which case you can probably make a ram drive for a scratch file.
Check out the rest of puget systems PC articles lots of good Adobe performance articles.
If you want to stick with AMD get the fastest FX CPU they have, and get a better than stock cooler. and AIO Liquid cooler tends to work well but will add a bit more cost than an effective tower cooler. The GPU and memory recommendations I made above still hold true.
If you are doing a LOT of editing. Then look into a PC case that has a couple of 120mm or 140mm side panel fans. I do not recommend the 200mm side panel fans as there are not as many options for replacing or upgrading them when necessary. the side panel fans put cool external air directly on to the motherboard and CPU cooler intake to help lower CPU temps a few degrees.
EDIT: I tend to NOT look over lists in detail as I make my purchase decisions based on the best performance
rice at the moment I buy, not tomorrow or next week. So a piece for piece build list tends not to work for me. Get a general idea of what you need and then go shopping