If you get a JK don't get one with the soldered-in rings "R" models, shadows etc. get a plain sx90 older model up to serial-no.1125xx. Putting those rings in there was the daftest thing JK ever did.
And don't mention "Thelmas" me neither, when I first played pro I went through three in quick succession - they just fell apart looking at 'em.
I've played JK tenor for not sure but very long now, but I got a very nice, ex-trade-fair Jupiter alto a couple of years ago, superb tone, similar feel to the JK's, and very solid build, hardly ever been in the shop for a service - It doesn't always have to be big bucks, big 5, these days. A solid well-built, no-name horn with a spot on set up is more than often the better buy.
gruss - spike