Looking to build first htpc

Ok so I'm looking to build my first htpc/nas heres what I have in mind. I know that sounds counterproductive but I would like to incorporate my whs with my htpc. I was thinking about running the os off of an ssd and the storage off of the hdd. I have 3 hdd ranging in size from 3tb to 1tb from a whs that I was looking to incorporate into this system. I was wondering if it would be possible to spindown or sleep the hdd while no data is needed while keeping the htpc running off of the ssd? This is what I was thinking for parts. I want to be able to do bluray, 3d, hd audio and also stream 1080p


Case:
COOLER MASTER RC-120A-KKN1 Mini-ITX Tower Computer Case

Power supply:
COOLER MASTER Elite 460 RS-460-PSAR-I3 460W ATX12V V2.31 Power Supply

Motherboard:
ASRock FM2A85X-ITX FM2 AMD A85X (Hudson D4) SATA 6Gb/s USB 3.0 HDMI Mini ITX AMD Motherboard with UEFI BIOS

CPu:
AMD A10-5700 Trinity 3.4GHz (4.0GHz Turbo) Socket FM2 65W Quad-Core Desktop APU (CPU + GPU) with DirectX 11

Ram:
Crucial Ballistix Sport 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model BLS2KIT4G3D1609DS1S00

Bluray:
LG Black 14X BD-R 2X BD-RE 16X DVD+R 5X DVD-RAM 12X BD-ROM 4MB Cache SATA BDXL Blu-ray Burner, Bare Drive, 3D Play Back

Need to figure out the remote and also win7 or 8 for base os