My reasoning has been thus. I have a pretty good collection and use them all. However, I don't have an alpha and given finances the Maven is the most I could afford, about 1000 bucks. It has good reviews. I'm good for the larger aperture. I have a 12, 15's, and a 20x. I am satisfied with those and don't plan to go to higher aperture. I can hold an 8x, but I have more problems with shakes then most given my age. The Obie 8x40's are actually the best for me as the weight helps steady them. Although it does tire the arms after awhile. That also attracts me to the Maven's since they are rather heavy. I might, maybe, would be able to hold the 9x and it has good reviews. However, I might end up having to use it primarily on the monopod if I can't hold it steady. I don't live in Tokyo, although I've been there, so might light pollution issue is not nearly as great.
I thought of going with the 6x30, but the 7x45 is attractive. The review at the bird forum said it actually had a larger fov then it was rated for. Those birders know their equipment. I grant that it is not in the 50 mm category, but it is close and I already have several in that aperture or greater. It would be good for daytime viewing, as the birders attested, and for relaxed hand held viewing of the Milky Way and larger Messier objects. I was tempted by the Kowa 6.5x32 with the wide fov, but the Maven would go a bit deeper and has greater clarity. As we all know everything is a trade off. I guess I'm looking for something that is versatile, that is not already in my inventory, can be hand held or used on a mount, and is of alpha quality without the alpha price. A Maven is half the cost of the European models, but is very close to them in quality. I also like these little companies that work hard to provide a good product and give good customer service.
So, I'm leaning toward the 7x45. However, I shall meditate further before plunking down that much cash. Thanks for all of the responses!