ouya isn't portable, unless you make it portable. it is as small as a soda can. I LOVE IT. The actual games it has are few and far between in terms of good ones, but there are a few nice ones on it. There's also atari 2600, nes, snes, genesis, tg16, psone, n64, and mame all downloadable free from the ouya store. I combined that with a 64gb usb flash drive and I've got every console I want on my tv, just like I have every arcade on my arcade machine...i got ouya knowing full well i'd use it as an emulator box and anything else would be icing on the cake... where else can you find an emulator box that small with wireless control for $100 - oh and with plex (another free download) you can stream your movies and tv shows to it also - or xbmc, that's on it too.
it's probably my fav piece of hardware over the past 5 years.