I like my 6 speed, I shift out of 5th at 140 and I've gone a buck 60 before and let off of it and I have the stock 4.10.
It's decent for cruising too, but they're right about the gears being close together, it's not much different from cruising in fifth. (Atleast at 80)
[I mean I was beaten by a 240 while I was close to topping out before, they're 5 spd though...right? I mean it was modded out the ass, but he probably had a 5 spd.]