Zulu, saxophone is a wonderful instrument. I still play alto in my local community college orchestra though I retired from teaching there several years ago. If I take a horn to a gig (rarel;y) I take my tenor. (BUt I diodn't grow up playim reeds)
For your husband I advise against buying a "classic" sax. Sure, they are cool, they have soul. But buy a modern horn with good ergonomics--that is, easier finger movements. This important on a sax. What does a guitar have? A neck and strings. A sax has hundreds of little pieces that all have to work together at the right time.
I respectfully disagree with Minnesota. Your husband is not a 3rd grader, where perhaps going from clarinet to sax makes sense. He is an adult who wants to play sax? Get him a sax.
My advice? First do not buy a brand new $500 sax from E Bay. Take JP's advice: hop down to one or more music stores and look at their selections of used horns, perhaps with a certain wareranty. As GAD says, go for a Yamaha. They are well built, made in massive numbers, and are good values. Plus technicians like them: important because they must be serviced every few years--and occasionally fixed.
Buy a used horn from a shop and you have started to build a relationship with that shop,. They know you. They'll take care of you. They'll show your husband how to put it together, take it apart, clean it, and store it. Brass instruments can suffer from "red rot," which is when the copper leaches out of the metal and degrades it because of the moisture left in the horn body. This is bad. So the horn must be cleaned after each session.
Stay in touch here Zulu; let us know what you have found, OK?