My HTPC is going to be my "stream-to" box of choice. The server, while beefy, will just be that, a machine sending the bits of data around. My HTPC is going to run things like madVR and other video processing to give me what should be the absolute best picture for in the theater since I have a 138" screen that will show less-than-perfect images pretty well. For that level of quality, I need the horsepower.
In the family room on the 50" TV, I will probably just use the XBox 360 as an extender or some sort, in the living room upstairs with the 47" TV, I am thinking about a Raspberry Pi running XBMC to stream to.
On my HTPC, I just started messing around with Media Browser Theater (don't ask me how I got the install). It is pretty slick, but has a lot of bugs. If Media Browser 3 Classic had a built in player instead of being requiring Media Center at its core, I would probably just use that instead.
