Yeah I just returned a Corsair CS series powersupply... I like corsair products but I have come to understand that corsair's budget series aren't their strongsuit.
1.) Not much of a sacrifice considering 120GB's can store Windows 10, Ubuntu, 28 Steam games, other miscellaneous programs, and still have space for a few more applications. Especially considering the read/write speeds of my SSD are significantly faster.
2.) The H100i is an amazing cooler. It keeps the internal temperature of my entire computer lower since a traditional fan cooler is an open system.
3.) That RAM is inexpensive and MUCH faster at 14 latency speed. It is also the highest clock speed that the i5-6600k will support. (2133Mhz) 16GB comes in handy a lot with some of the programs I run and you can guarantee it will be necessary on an even broader level in the near future. I compared RAM and the Kingston is only $0.19 more per GB, and currently comes with Rainbow Six Seige.
4.) The SLI KRAIT series has always been my go-to. I still have my Z97S from my I5-4690k build. Really great BIOS, great features, durable, and VERY aesthetic. I should point out your build is entirely uncoordinated and it looks like you might know that since you went for a windowless case. I get that aesthetics aren't everyone's concern, but the build I have looks great and I would certainly put value on that.
You thought it was poorly optimized and those are the only changes you made?
I agree the build is not well optimized, and I would change nearly everything about it as I did here:
XFX Radeon R7 250 4GB Video Card... Is it really a 4GB VRAM Card? I've looked all over I can only find 1 and 2 GB r7 250's