Octalink is fine, so is old school square taper. Sugino makes a nice touring triple that uses square taper, RaceFace also makes nice touring cranks (I have a bike with the Turbine) , as do Shimano (and the touring LX seems like an especially good deal). You won't be replacing a bottom bracket very often no matter what brand or type you use. They are inherently long-life components, like most headsets are. Pick one you like that has the chainrings you like.