have some shimano one in one bike, that's sealed. it's the commuter so it works nicely for that, a bit rough feeling though.

i have a sugino 75 on another, spins like butter, nice weather bike.

road bike has whatever goes with sram red. that's pretty sexy too.

go sealed for a bike that will see water, it's more convenient. that said, it's not too hard to clean an unsealed bracket.