I would say that because you agreed to that condition, you should keep it. That's not being a "doormat"; that's called personal integrity.
There are several sporting standards that might meet your riding desires, while not making your wife as nervous -- Triumph Speed Triple or Street Triple, Ducati Monster or StreetFighter, Kawasaki Z1000, Honda CB1000R, Yamaha FZ1/FZ8/FZ6, MV Agusta Brutale, Aprilia Tuono or Shiver, Suzuki SV650/SV1000, Buell CR1125, Moto Guzzi Griso, BMW K1200R or R1200R or F800R.
Personally, I think that if you ride like an adult, sportsbikes are the *safest* bikes out there to be on. No bike is good in an accident; your only defense is to avoid them. The superior acceleration, handling, and braking of sportbikes gives you the best tool for being able to do that, provided you use it properly and have developed the appropriate skills.
1993 Ducati M900 Monster "Patina" (228,000 miles, so far) -- 1995 Ducati M900 (wife's bike) -- 1972 Honda CB450 (daughter's bike) -- 1979 Vespa P200 (daughter's scoot) -- 1967 Alfa Romeo GT Jr. (1300cc) -- 1964 Vespa GS160 (160cc 2-stroke) -- 1962 Maicoletta scooter (275cc 2-stroke) -- 1960 Heinkel Tourist 103A1 scooter "Elroy" (175cc 4-stroke)