To be honest, I like permament dumbells because free weight dumbells are impossible to toss up with your legs while doing incline and shoulder presses. (Having a 1 or 2 inch bar on a 100 lb dumbell stuck into my lower thigh while tossing them up is not my idea of comfort)
Alas, a good dumbell set like this costs thousands of dollars.
So a good alternative may be dumbell hooks like this:
http://www.gncgear.com/cgi-bin/shop/...alPage=weights
I've thought about trying them. Has any one given them a go?