In reply to Dr Avid:
I've got the manfrotto 190CLB but with the 3 way magnesium head (420?) - which does have a spirit level in it. Nice solid piece of kit and think of the extra training value from carrying it around, compared to the carbon fibre ones. Did 6 miles with mine on Saturday!
I tend to use mine even with short lenses at dusk and dawn - by the time you've got some ND grads on to balance the light, and stopped down for max d.o.f., you're definitely in the "cannot be handheld" zone..
Have fun whatever you get!
Paul