As you would guess from my previous posts, I am a Spyderco man. I rate Spyderco as the best production knife for the money, bar none. The StarMate and the Military are the functional equals of the Chris Reeves Sebenzas that I have handled at one third the price. They lack only the fanatical detailing that Chris Reeves gives his knives, but the have, I believe, better steel in their blades.
Next, I would rate Benchmade. Their product is almost as good as Spyderco's in fit and finish, but they don't use 440V. They do, however, have the axis lock. It is theoretically better than the liner lock that Spyderco uses although I have never had a Spydie liner lock fail on me.
Similar to Benchmade, I would rate REKAT. They have come a very long way lately in their quality control and their products are hell for leather strong. They are probably THE standard for solidity when it comes to working knives. The Carnivour is built like a tank and will probably outlast any knife you can name, and their Sifu has become a legend in its own time as a mega-folder. They are, however, outside of the price range of $100 that you set in your other post.
Buck has long made one of the standard folders, the 110 Folding Hunter, of the industry. It is the knife that you will most likely see around construction sites, on fishing boats, and on long-distance truckers. They have been making and selling them forever and they have the system down pat, so that there are no bugs in it. They are cheap, solid, and a great buy for your money, if a bit old fashioned.
I do not like Cold Steel. Their products are sold mostly on the owner's hype and the ones that I have bought do not seem to be up to snuff in quality control. Further, they do not offer the option of factory resharpening their serrated blades as does Spyderco, so that you have to attempt it yourself, and probably mess it up, or grind the serrations off, as many did with their Grand Vaqueros. This sees to me a bad practice of not supporting your own products.
I cannot speak to the other brands that you have named.
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Walk in the Light,
Hugh Fuller