I've got a 710HSSR, 940S (and a 941), but no 14205 (though if I could go back and do it again, I'd probably get one over the 420 that I have).
The 710 is an excellent knife that carries incredibly well for a knife of its size (nearly four inch blade). I tend not to like recurve that much, so of these three knives, I'm not sure the 710 would be my pick, but whether or not you like recurve is up to you. (I will say, though, that serrations on a recurve make the serrations much more useful; not sure if you want a combo edge, though.) Oh, and I should also mention that the geometry of the 710's blade is fantastic: this knife sails through materials extremely well, even when it's long past the time that the knife should be sharpened.
The 940 (like the 710, but more so) carries extremely well for its size. It's nice and lightweight, but still gives you a full, normal sized blade to work with. The reverse tanto can take some getting used to aesthetically, but functionally it's every bit as good as any other blade shape. Also, the 94x series from Benchmade are among the smoothest and easy to open/close knives that I've handled.
As for the 14205, it's probably the toughest of these three knives, so if you give your knives a beating, this is probably the one I'd recommend. The blade is much thicker than the other two, which gives it strength, but this could hinder your cutting, depending on your use. Also, if you have normal-sized hands, the 14205 might feel more natural and be easier to open and close than the 710.
Of these three knives, I'd personally opt for the 940 if I could only have one. If I were harder on my knives, I might go for one of the others, but the 940 carries so well and is such a pleasure to use that it would have to be my pick. (Plus I personally find the 940 to look a lot more classy than the other two knives here somehow.)
