I'm building a WHS 2011 box and plan to use Mezzmo.
I am worried about the hardware needed to support streaming with transcoding.
Seems some people have really heavy duty hardware and still are having issues.

File types to be streamed:
DV (.AVI) - from Sony MiniDV
AVCHD (.MT2S) 1080p/60 from Panasonic TM700
DVD (VIDEO_TS)
BLU-RAY - Format yet to be determined but most likely .MKV format medium/high settings

Main Device is Sharp 70" TV with PS3 slim and Windows 7 PC attached to it
Also have
Wii attached to old Toshiba Front projection TV
WD TV Plus - Not in use, but can be
Various Windows 7 PCs

How much transcoding will be going on?

Should I use a Dual Core E8500 (or E5800) with 4GB or Phenom x4 B50 with 8GB.
What ever is not used for WHS 2011 will be box attached to Sharp TV with GTX 560ti for gaming.
Also building a 2700K box, but want to use this for Video editing with Sony Vegas Movie Studio Platnium 11 and ripping.

Would really like to use the E5800/E8500 if possible.
If I stick to the PS3/Sharp TV would this be OK?

Thanks for your help.