Your looking about £800-1100 UK RRP for the basic Gibson KN RD sig, where as on ebay for the classic Gibson RD is £1700-2250 with different finishes, vintage appeal and all the other bells and whistles . . . . all depends on your wallet if your truly after a RD for this sort of money.
admittedly, id own both if i could as they both seem real nice basses. The classic is delicious as a collector item and 'Only at home' instrument and the KN would make an excellent work horse for me
BSB