i've the 2nd gen sony google tv...free from credit card app
plays everything I throw at it
no XMBC hack supported yet though...and the remote is cumbersome (boxee box has great remote)
there should be a flood of these on craigslist...throw an offer $120 to one of the ads
Also...i personally have not looked into yet..but boxee TV is $99...i'm suspecting a lot of features/fcns are limited the USA though
http://www.boxee.tv/#home