In order of importance for me:
1: Touch. This encompasses noticing pain, temperature, feeling objects, everything. The only life truly too sad would be one with not being able to feel any affection, or anything at all. Touch is what makes the world seem... real.
2: Sight. This one speaks for itself, and I like my computer and not being run over...
3: Hearing. Not having any good person to person conversations would be horrible, and I like being able to hear things, people, music and all that.
4: Taste. Chocolate is good, and it certainly tastes better than it smells. But I wouldn't give up any of the above senses for it.
5: Smell. I don't use it much, my ability to smell is crap and considering that my parents are vets with many many pets, what I smell normally is crap.
Bye bye smell, I never needed you anyhow...