I would focus not on AUW but "how much can I carry".
R66 - 5 people, 3/4 fuel, OGE hover no worries. 120, Jetty etc...no way. B3e...different machine altogether - twice the price (to own and run).
505 - same motor as the 120...it all depends on how much stuff Bell jam into it to make it fly. I suspect similar performance to the 120...which is such a lovely looking machine, but a very poor performer (even in the hands of JohnR81...who is the 120 expert !). And the 505 boot (trunk ?) is about 1/4 of the 66.
I worked this out once (for a mission) the following. R66, 4 pax, 4 overnight bags, full fuel, 2 sets of golf sticks...off you go. That's pretty cool...and there are 500 of them flying around now.
Arrrj