a few of my mates have had RGs and RDs and after seeing both of them i would rather go for the RG, the RD is MASSIVE really long and really tall and ugly to as well as being not as good as the RG (so i am told dont start throwing stats at me!!!) .
personally if i was gonna go own the silly 500 route, a mate of mine has found a kit so you can fit the gamma engine in an RGV frame they sell the pipes and everything already fabricated.
_________________
MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold