I say kick start only for the R3. (that will weed out the casual riders)
I do like the factory 904 and 6 speed ideas for the smaller twins.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter