first build htpc smal questions

I'm picking out components according to the guids i have read but still some confusions.
Goal is 1080 3d movies streamed from my synology nas.
This would be my upgrade for playon hd with future plans of pvr if iptv is going to be supported.

Case SilverStone Grandia GD06B, mATX,
Or
Case SilverStone Lascala LC13B-E, mATX

Cant completly figure out if it fits fm1 series
Cooler SilverStone SST-NT01-E

Mobo pick is a personal thing i think asus will be my pick
mobo Gigabyte GA-A55M-DS2 FM1 A55 2xDDR3 mATX
Or
mobo Asus F1A75-M PRO R2.0 FM1 A75 4xDDR3 mATX

How big is the a8 advantige above the a6
proc AMD A6-3500, 2.4GHz, 3MB, FM1, HD6530D
Or
proc AMD A8-3850, 2.9GHz, 4MB, FM1, HD6550D

ram Kingston HX Genesis 4GB(2x2GB) DDR3 1866MHz CL9
ssd OCZ Vertex 4 or Crucial M4
fans NB eLoop B12-2, 120mm, 1300rpm, Wit/Zwart
fancontr Lian Li TR-5, Fan Controller, Zwart
remote ps3