I can't see how taste and smell are together with Sight and hearing though. I can't see me enjoying life without either hearing or sight.
Of those, I do think I'd give up smell. I don't smell that well anyway. But indeed that is a tough one.
The one I've asked myself, and friends, more is if you had to choose, would you be
1. Blind
2. Deaf
3. Mute
but then it's even easier, I'd rather be mute. it can be replaced by say, writing. And it comes back to that life is so beautiful I need to see it, and I need music.