Mobo: I'd bring it down to the Z75 Pro3. I'm pretty sure all you lose is SSD caching (using an SSD as the cache for your HDD instead of as a separate drive, I doubt you'll miss it).
I'd change the PSU to
a different brand, with a lower capacity (500-550w, let me know if you need suggestions).
The only other questions would be what you want vs what you need. Do you need the additional HDD space? Otherwise you could get a nice 128GB SSD for $10 more (the $10 you saved on the mobo). Same with the case. Are you getting it because you like it and want to splash out (cases being able to house multiple rigs over the years)? If so, that's cool, but it's way beyond what you need if necessity is all you're concerned with.