I remember having this discussion in school years ago and I had no idea which one I would go without, I still have no idea lol. I wouldn't want to go without hearing because I want to hear music, people talking to me and etc. Taste is too valuable, I like being able to enjoy my food and it would suck if you couldn't taste it. Seeing is very valuable as well..

Umm, I'd either go with scent or touch. Let's just say not having scent, it would be hard to deal with but the others are more important. =\