I agree with Mr. Raymond that you can easily find a used (sometimes more used, sometimes less used) large 21 for $300-$350 that will last you the rest of your life although there is something about getting one brand new and you're the one to break it in and it's yours and only yours. Beat it up a little and don't like how it looks? Tried out a scotchbrite finish and don't like it? Send it in and for no more than what it costs for you and your lady to get a couple burritos from Chipotle, you end up with a brand new knife in your hands after a few weeks. I think it's natural for knife enthusiasts' tastes to evolve, and I'd only recommend people to move up to CRK level and higher only if they've tried out a bunch of stuff from different brands and aren't satisfied and looking for something more. It ain't gonna cut any better, but like most finer things be it wine, watches, etc, it's just one of those things you have to appreciate for what it is. I can't speak for any of the others' customer service or quality, but all of this applies to the other options on your list except forget finding a Hinderer for $350.
As far as being different, what do you drive? Ford, Chevy, Honda, Toyota? Everybody's got one of those too. Get what you like.