ZR1 RM looks the best and is the fastest in a line (best acceleration)
ZR1 RM, Z06 RM and C5R all drive great, 3-way tie in handling.
They all sound like... well, they could sound better.
My $0.02
I find that my Z06RM will out pace my Z1RM almost everywhere and handles better too.That may all be due to the tune I've found for each or simply my preference.
The C5R isn't even in the same league with the RM's IMO.That one ranks a distant 3rd.