Once these computers come online and you can actually buy one, I am getting a Raspberry PI for 25 bucks.  It appears that there are 100,000 or so back orders in the queue ( that is British for line ) so we may all be waiting for a good while to get one.  The 35.00 model has a few more features like a network connection, but either one would be fun to have in a Comp Sci class.  My students all thought this was awesome and they all want to buy one and think that everyone else needs to buy one as well.  Happy Hunting!