Guys, I think some of you are missing the point (
): he bought the 450 so that his wife can learn to ride! I, too, lament the sale of his 750 (mine is for sale, and I have an interested buyer coming next week...), but he is making an investment in his marital future -- coaxing his wife to not only ride, but to drive!
My wife took the MSF course, learned to ride on our now-sold Kawasaki 440. Today, she is a veteran tourer, handling our 1200 Voyager like a pro. I don't hesitate to take naps when she is driving the Voyager, and I am behind her. If my wife hadn't learned to drive, we would be limited in our touring: I can only drive for around 2-3 hours before I need a 30+ minute break! We trade places, so I can rest, but I also enjoy the scenery much more, as I can actually swivel my head to drink it in, without worrying about controlling the bike. Think what you will, but my wife and I LOVE touring together, and we sometimes argue, in a good way, about who gets to ride in back. We both love to drive, but we both love to enjoy the freedom of riding in back, as well.
When touring, on one bike, having both of us capable of driving, is essential. If one of us is ill, the other takes over, assuming the sickie is not too bad off. This has happened on several tours, and it was wonderful that we could continue on our way.
There is also an intimacy involved in changing positions on the bike. By letting her drive, I demonstrate that I trust her with my life, literally, not figuratively! It has strengthened our marriage, improved her self-confidence, and drawn us closer, as few other things could.
Cheesehead, you will not regret this investment in your marriage. Biking together, on one, or two bikes, will help your relationship. And the best part is, you get to do it while enjoying your passionate hobby of riding motorcycle! There is no down-side to this, other than the loss of the 750, which, as you say, will eventually be replaced. The 450 will be an excellent bike for her to learn on, and it appears to be in near-mint condition! It is very stylish, so she won't be embarrassed to be riding it, which is important. I think you made a superb choice in this bike. Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII