Rob
I used to have a '92 851 with white frame, black and white 888 decals and a c/f single seat with number 1 as lacquered c/f weave. It sure looked better than the SP5 stickered tailpece.
The bike looked great, but I got fed up with people asking is it an SP whatever?
I then bought what I really wanted, an SP5 - but along with the looks, you get the suspension, motor etc etc.
It surprises me that a lot of guys on this board chuck so much at their regular bikes when they could probably go out and buy a pukka bike in the first place
If I were you I'd paint it in the '92 851 colours with a plain red tail. You'll get none of the annoying questions, the bike will look spartan and tough, and best of all it will be predominantly red, which is the only colour which looks any good on an 851/888 (and you wont have to lick Nat's rim for decals, so it will be cheap!!).
Yellow and black both look pants, silver is pretty good.
People only have different coloured Dukes these days because they are so common and people like to be different.
Remember the 851/888 is a rare sight still - keep it red.
Regards
Justin