Student instruments normally have smaller toneholes than intermediate and professional instruments.
The smaller toneholes affect the overall tone.
So when you ask me about student instruments I normally disregard "tone" as a deciding factor.
Young players have smaller fingers and with the smaller toneholes are more easily able to learn to play the instrument.
I have small hands and small fingers so I notice these things immediately, For instance when I had my 1950s Selmer Paris Centered Tone clarinet, those have very large toneholes. I could literally stick my Right Hand 3rd finger INTO the lower 3rd tonehole.
Setup is also extremely important. A very slight leak up top can affect the tone immensely though not all techs pick up on very minute issues with a clarinet setup.
A Marigaux SML also may be above your budget.
It's all down to budget and right now you are leaning towards the lower end of your budget.
A Pre-R13 clarinet are very wonderful clarinets when properly set up. It was mentioned in your first post.
Personally, with my experience (and I'm a tech so the rest doesn't matter) I'd opt for the professional Buffet.
Then the yamaha 34 you mentioned above.
But if you also have to spend money after a purchase to get it set up properly then that may affect your overall budget.
You have not been clear enough, nor provided links to existing clarinets, to make much more of a determination of which is good and which isn't. Descriptions may include "cracked" or something like that. Which if not properly repaired may not be a good option at all. Keywork may get pitted (which I've found a lot of Signer 100s like that).
So it all depends.
If you were comparing brand new clarinets that went through the same set up with the same tech then it would be easier to compare/correlate various clarinets.
Its like buying a used car. Think of all the pitfalls of a used car over various sellers/dealerships and clarinets aren't far behind.