I've been running 140 Floats. Not fantastic for climbing, but not disastrously bad either. Good for almost everything else, though.
Saying that, I've just spaced them down to 120. Haven't ridden it yet so can't offer a comparison.
Incidentally, I'm 5'7 and ride a 17.5, so I suspect you'd be better off with the 19.5. I've not ridden a Hustler, but the Handjob has bags of standover compared to a Hummer if that's any help.