Sadly, I'd have to pick taste. Unless someone is specifically trying to murder me, I'm not about to ingest any poisons that I need to detect with taste, but smell? Gas leaks are not so uncommon that you want to be unable to detect them until you throw up- there's a reason they add scent to otherwise odourless gases.
The others are totally essential. We define most everything in day to day life in visual terms, and touch lets you know when you have applied your hand to a super strong, concentrated acid.
Hearing lets me listen to music and tell certain people to fuck off and let me buy 1$ headphones to listen to youtube soundfiles, I can barely distinguish between audio qualities anyway. And what does it matter to you, anyway? Exactly, go back to your 10000$ sound system.
Sorry, what was the question?
In an aside, Captcha asked me to type the symbol for "Beta". I do not have that key on my keyboard, should I? I mean, you only need to get one word right, but still.