I would pick The next Sony product.
Other than Gears, Halo and a couple others like Splinter Cell, the 360 doesn't have many exclusives that I enjoy. I didn't like Mass Effect at all and Forza
Same goes for Nintendo, I'm not a big Mario or Zelda fan.
Sony has a ton of franchises I love. Best racing franchise in Gran Turismo, and good ones like God of War, Killzone, Resistance, Uncharted, etc
As for handhelds. Most likely none. Maybe PSP2 depending on price. I will probably buy a new iTouch/iPhone in the future.