If you're willing to give up multiplier overclocking, you could maybe consider a Xeon E3-1231 V3.
I also don't think the RM series is worth the money. Build quality isn't that great for the price, and the 550w and 650w use CWT as their OEM and don't perform as well as their higher models.
Also it looks like you want to add a 970 in the future, as well as overclock. I've stuck with 650w if this is what you want to do.
Slow hard drive.
Faster RAM. Doesn't go too well with the color scheme, but the R5 doesn't have a window :P.
That Xeon is actually very appealing...might get it. And yes I do want to add another 970 in the future, I probably should have been clearer but it was something like 1 o'clock in the mourning and I needed some sleep :P