This one looks cool, and it's from Sweden which is always a good thing. The OP-1 from Teenage Engineering has plenty of functions and seems to have a new take on the graphics display. More intuitive and colourful, sort of. It's a midi controller, has a built in synthesizer, a built in FM radio and a mic (for instant sampling), a motion sensor for modulation (you can shake it!), and lots more. Perfect for bringing to a deserted island. Relase date in about a year, according to their website. Read more here