Being a long time player of Series 9 horns (some forty five years on the Bb and about thirty on the A) and a relatively long term player of the Series 10 and 10S (about seven years now), I clearly prefer the Series 9 horns. I like some things about Buffet style and feel (which the Series 10S offers in spades), but I feel that the Series 9 has a superior tone and "feel" to it.
And, as I say on just about every occasion, if I had to replace my horns with something else, I'd opt for a pair of Recitals. I can't express how much I love that model of clarinet, fat body and all. However, they don't (Chris's recollections aside) seem to offer the keywork that I want, so I imagine that I'll just stay with what I have.
Gear acquisition syndrome (which is what "GAS" means, I gather) gets exponentially more expensive the further away from the most critical component (the player) that you get. (Practice is cheaper than reeds, reeds are cheaper than ligatures, ligatures are cheaper than mouthpieces, mouthpieces are cheaper than barrels, and barrels are cheaper than horns.) As there are so many different combinations that you can make here, it's almost futile to look to the horn as the way to "fix" the problem.
But, if you've got the money. that's easy enough to overcome.