Yea the SV650 ended in 2008 but there are quite a few available used. The Gladius is basically the same bike with a new look and name.
The SV650S is not the same bike. It has clip-on handle bars and more rearset pegs causing a more aggressive riding position.
You wife may like one of the naked or faired standards mentioned above. Very different look but a similar riding position to the Bonnie but somewhat lighter.
I know what you mean by keeping you options open. I can see why some people get a new bike every year, or have a half dozen bikes in the garage.
I really like my Ninja 250 but I could use a little more leg room. Dual-sports are also intriguing, especially given the condition of the city streets I commute on and my parents dirt road. And bikes like the Bonnie just look great.
Too many toys, too little time or money!!!
Craig