I've started playing piano and find it much more fun than guitar 'cause you can play counterpoint stuff and that's pretty taxing for me. I really love the guitar though, there's nothing like it for expressiveness but you can play more combinations of notes on a keyboard. I'd like to redress the balance by playing the wrong way round (I.e with my more coordinated hand on the fretboard) and becoming ambidextrous. Then maybe I'll be able to play a double neck like MIcheal Angelo has and arrange some piano music for guitar. I'd love to hear some Gottschalk on Guitar. The other thing I'd love to learn would be the fretless bass, it's a beautiful instrument and the bass can be a beautifully percussive or really soft sounding instrument - there's a greater range of dynamics to it than guitar I think.