Sorry, John- was crazy this week and I actually forgot to get the weights for you- the weights are usually listed in the intro manuals and the TDMs (MB hymn books). I will get the weights next week for you.
You mentioned the 65 in another post- there would be another way - the V12s have been shrinking, but the turbos might be an issue- it adds a little size around the mid-belt area, where the 107 has little to spare.
I get your feeling for the V12s, but honestly, it depends on what you want to feel- the 55 is a jack rabbit, the 65 is a smoother, more torque feel- even in a 230 chassis- the 55 just feels faster, and wayyy more driveable when even turns ,etc. - the V12 just seems to add too much weight to the front end.