Any used Yamaha, under $400 is a steal, esp for tenor. A good used YTS 23 would do fine. Or a YTS 52, although a lot harder to find, cheap. They are intermediate horns, and carry enough quality to get you to pro level. Hold alot of their value, btw
Conns usu arent made well. Ihave a 22M, but its not made well at all. Sounded good when I got it I guess.
Bundys are ok, Conns are better, but they are very very beginner horns.
Nowadays there are alot of pretty pieces of crap out there. (Jupiter, Monique, etc). They look good, but are poorly made and sometimes have intonation problems.
Selmer (student models As300, etc.) - I am so not a fan of them. Id rather get a Bundy. They're expensive as crap new, but its hard getting a good sound out of one, and keys are super tight and hard to press.