Greetings:
[ Vision limited retired video engr here. ]
My son gave me the pi B he got free attending F8. Setup went fine using LAN to update,etc. Used Noobs to install Raspbmc on Noobs microSD. Edited config.txt to lower HDMI res for Raspian and was able to reduce non-movie res in XBMC, but have not found the way to make Arora similarly lower res. I'd ask Don Lessau, but he's busy w/ XYp. :^)