If you are seriously asking for advice, Taz, then, as Stephen Howard says (more or less) in his website('Buying a pro sax'), asking a group of 'strangers', of widely varying musical tastes, playing abilities and prejudices, is probably not going to provide you with much useful data....... unless, perhaps, you get several people saying "Don't waste your money on (for example, Borganis)...they all fall to pieces in 2 years ...(I am sure they don't, but you get the idea). There are, I'm sure a few cr@ppy makes/models around which you should be warned-of, but most will, in the right hands, play 'well-enough' to suit at least a few people. I may be very wrong, but I'd guess most of us, will never be really good enough to truly reach the limitations of what we have. The rest is GAS, but it can be fun....if we realise that we won't sound even
nearly twice as good on a 2.5K horn as we would on SOME which you can now buy for half the money
Most teachers seem to be conservative and recommend what they themselves have played for 30 years, and view any new-fangled manufacturers with grave suspicion (sweeping generalisation, but I have often seen it written in the forums).
Most of us like what we have settled-on, just because it suits US ....or we cannot afford an Inderbinen
)
As a raw beginner, I found someone whose advice I trusted and followed it.....when I 'upgraded' I did the same (with Pete), because a) I wasn't skilled enough to trust my own selectivity, nor b) was I in a position to try-out several different makes and models. It's worked well, for me.
The alternative, if you are not as constrained as I, is to make a 'short list' from the many recommendations you will probably get, then try to find somewhere where you can try-out most / all within a shortish space of time, and make your choice of what seems to suit YOU.
It is all very subjective..... I believe my teacher sounds just as good on my BW as he does on his 50+ yo MkVI, for which he's turned down offers of nearly five times the money I paid
.... but I doubt he'd agree.