[One, Two, Middlesboogie]

Id get rid of taste. As has already been pointed out, 'taste' is really mostly smell. Have you tried eating bread while holding your nose? If you do so, you'll find it's utterly tasteless. All the flavour is in the smell. I love bread, and if I lost my sense of taste I'd still be able to enjoy it.

I definitely want to keep all the other senses. If I couldn't see I'd never be able to play a videogame ever again. That's just too depressing to even think about.

I'd hate to lose my hearing as well. No music for a start, but also unable to hear that bus approaching me from behind...

Actually, it might be quite cool to get rid of my hearing, and have a really expensive and really good hearing aid put in instead. As long as I could hear with it at least nearly as well as with normal ears, it'd be great because I could switch it off at will!
But seeing as we're talking about 'which sense would you miss, that implies getting rid of it altogether.

I wouldn't want to lose touch, for all the reasons Teal outlined.

So, taste it is, then. Although, like Teal, I'd rather just donate an organ. Preferable not a kidney, though. You can have my toes; I don't use thm for anything. Or my appendix, or my tail bones.