listed by quality and also by priority.
Gec- limited on options that you can get but its worth snatching (or try snatching) what you like if you can get the opportunity. These are the best quality but even with the best quality some of the more recent demand has caused some to question this. Though even questionable samples are better that the rest. If theres one you like then dont be shy about the “wanted to buy” subforum.
Boker- many different bokers out there. You want the solingen for the most part. They have discontinued some of their traditionals from there recently. Quality is between gec and case. With a few exceptions being exceptional but you will pay for it.
Case- while they have qc issues, most dont have too bad of issues that will prevent using them. Theres plenty that they make without issues. Price usually reflects quality keep that in mind.
Rough ryder- if you dont mind china, they have some interesting patterns as well as models they do well. Their carbon classic series are good users and might not be available much longer. Rough ryder reserve draws interest as well as criticism which it deserves. Though quality of the reserve line is solid. Overall, they are worth the few dollars to spend to learn what gec pattern you would be willing to dedicate time and money into.
schatt&morgan, queen, camillus, buck, remington, schrade, bulldog brand, moore maker, etc...
These are a few other brands that either arent made any more, made by separate company, quality shifted from good to bad, and some of these i just dont know much about. Its worth noting, even though some of these are no longer made, they can still be found new.