I would probably give up smell. Besides detecting smoke if you are around a fire, and making food taste better, I would be ok without it.
The sense I don't think I can't live without would be proprioception. (not originally listed, but was shown to be a separate sense). I can't imagine going to scratch my dick, only to end up with a finger in the eye because I couldn't coordinate my hands. :-)
But of the ones listed, it's between sight and hearing that i cant live without. I just cant decide