Can't speak to the quality of the B&S, but I can say I've played some nice Hirsbrunners.....and some real dogs, too.
I've heard from some very good euph-playing friends that the Nirschl euph is the cat's meow, but its also in the same price range as the Hirsbrunner.
The new Besson Prestige is supposedly an improvement with the new valves, but again, not cheap.
I, personally own a fantastic Meinl 451 that I can say enough good things about. These horns had some intonation problems when they first came out, but that didn't seem to be the case when I picked out mine last year. I played it against 3 other 451's and 2 551's and this one just sizzled.
There's a nice used one that's been advertised on here for a bit that might be worth your while:
viewtopic.php?t=21547
Can't speak to that particular horn, but would be worth looking into and seeing how it plays for you.
Good luck in your search!
Josh
Question regarding B&S Euphonium
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This forum is for buying or selling your personal equipment. Sponsored selling is allowed as well. All ads are required to have the following information: Price (even for trades), brand, model, and location (City and State, for instruments, not accessories). It is acceptable to link to an external ad if you are promoting a sale of your personal equipment. No Ebay auctions, but "Buy It Now" listings are fine. Photos are HIGHLY suggested as well, and may be hosted on Google Drive, or elsewhere. If you see an ad that does not meet these criteria, please report it.