Had the RZ250 and always lusted after the Yam RZ500 and the Zook RG500...Evil beasts that they were!
Have been lucky enough to (try) to ride an RG500 and it was a light switch, scared the sh*t out of me it was so insane, and this was done at low speed on the Old Pacific Highway so when I say low, I mean very low.
As for the RZ500, I prefer it but that is all about the looks and the yamaha red/white scheme ......... Gorgeous machine
Last one I saw for sale was 20k for one with 11000kms but I did see a new in the crate one last year for 40k