I know this isn't gonna be any help to you, since you're looking at new horns, but I gig with an ancient Yani alto and I've never been able to find one better. It's an old A-4, probably from the late 60s. Excellent tone, not too bright, not too dark. Rips into scream with ease, and can purr like a kitten in the next breath. A heavy horn, too.
If I was to go for a new one, I'm sure the current Yani lineup would be at the top of my shopping list.
As I'm really a tenor player at heart (Buescher 400), I like horns that play fairly dark.
If I were you, I'd give the Yanis a blow and see if you like the tone and action. I believe you can be confident all the rest - build quality, resale value, service, etc - is already there.