A cross between Valhalla and the Galaxy class would be nice. The super saucer and the nice big secondary hull, but with raised nacelles of the Valhalla.
I don't mind kitbashes at all--the only thing that needs original drawings are the nacelle support pylons. There needs to be some new mersions of those so as to keep things organic.
Cranked arrow designs where the nacelles either emerge from where they do on the Refit--or a bit lower down and back from that extended secondary hull.
The nacelle pylons then flow back, then up and back at a different angle, so as to keep the rakish look. Simple triangular nacelle suports clash with the fluid secondary hull. Those are best for Stargazer designs whereoriginally seen--in their industrial setting.