It's for my mother who loves the look of my HTPC with Media Browser. I've been looking at Boxee Box but have read quite a few negative things about it, and I'd rather not have to worry about having to go to her house every time there's a firmware update, Flash issues with Apps, etc. I figure I'll put the movies/TV she loves on it, set-up MB/WMC and be done with it.
She'd pretty much only use it with Netflix, Hulu Desktop, DVD MKVs rips made with MakeMKV and some 720p stuff (I assume my BD rips won't work).
I'm really just not sure how powerful the PC needs to be for her basic needs.
For context, I'm running an old (until I update it later in the year) Intel e2180 with 2gb of DDR2 800 memory without a problem. I use it for XBMC streaming from my server, netflix, and Amazon streaming without a problem. I just overclocked it to 3ghz but it did run just fine at 2ghz stock.