Looks good as is. Here's some suggestions.
Take a look at the R4 case
. Some improvements were made over the R3. If you spend a fair bit of time photo editing, consider moving up to the i5-3xxx. Photoshop, Lightroom, etc. make good use of 4 cores. The Mugen 3 has ~48mm of clearance
from the bottom of the fins to the mobo surface. So, keep away from RAM with tall heat spreaders.
How much RAM: Is 8GB good enough for your VST's? Also, if you are a heavy photo editor, consider 16GB as Photoshop loves RAM.