I'll chime in and say I got the base model, this is what I can do with it...
I run xbmc fullscreen all the time, znc, sabnzbd (w/ post processing = cpu intensive), transmission, itunes server (streams to apple tv), i also ssh in and run handbrakecli which uses every spare bit of cpu you got (obviously this isn't super fast being a dual core mobile processor) - all of this works without xbmc so much as dropping a frame and it still (lord knows how) remains incredibly silent during operation...
Anyways, I could have afforded anything, I was just curious what I could get away with on a base model honestly, if it was insufficient I had 14 days to figure it out and get it back to Apple... does what I need though.
That's awesome. Have you tried playback of a full blu ray rip? I tried on my MacBook and it was really stumbling during playback. Keep in kind it a 40gb file with a crazy bitrate.