I bought a new NUC5i5RYH and am going to run windows 8.1

What is everyone's ideal system?  I am basically using it as a HTPC - watch movies, netflix, itunes sync to my ipads and iphones, and local photo storage (which I currently use a external 2 tb drive that I will just plugin)

I was thinking about getting a m.2 128/256 and then getting a 7200 rpm notebook drive for 1tb.  Will that run too hot?  I wanted to keep it as silent as possible.

So far:

Crucial MX200 CT250MX200SSD6 M.2 Type 2260DS (Double Sided) 250GB SATA 6Gbps (SATA III) Micron 16nm MLC NAND Internal Solid State Drive (SSD)  or considering a transcend 128gb? Thoughts?

Crucial 16GB Kit (8GBx2) DDR3/DDR3L-1600 MHz (PC3-12800) CL11 204-Pin SODIMM Memory for Mac CT2K8G3S160BM / CT2C8G3S160BM

I don't know what 2nd HD to get to fit in the 2.5 slot?  Any recommendations?

Any help in advance is greatly appreciated?  Am I missing anything?