I really like the looks of the 810 and 940. Is the 810 a good pocket carry knife? Also What does it mean if a knife's best use is tactical?
I'm sure you can see a lot of thread on 810/950/940 selections. IMO, if you like 531 950 would be nice choice.
I love all and own them. It also depends on where you will be bringing and what will you be using it for. Also keep in mind what is the legal limit of blade length where you will be carrying.
This is my choice.
940: Smallest sibling in Osborne Tanto blade. The design is very elegant and ergonomically stylish. It has aluminum handle and blade is less than 3.5". (The city law on concealed knife carry law). This is fairly light blade, so it will not ruin my pocket of slacks. It may seem weak, but have no doubt, Benchmade has constructed this blade AXIS lock to withstand quite a bit of force. (698inch-lb of torque). Also narrow blade allows it to appear smaller (for the benefit of other people) so that it don't look like you are carrying huge knife.
950: a middle brother blade. It has very good ergonomics that fits in your hand nicely. If you are very tall, has bigger hands, you may want to test the grip before you buy. G-10 handle offer more grip than anodized aluminum handle. If you think G-10 is too rough, you can sand it down the edge with wood working sand paper and that will be the end of problem.
810: Biggest and has high jimping, very rough texture. The steel (M4 or M390) is one of the toughest, most wear resistant steel being used in production knife. One can EDC it, but I found it to be over kill. It comes in handy for weekend yard work, camping.
So, here is what I use. If you "work" in office environment, or wants to carry in downtown, urban environment, 940 will be the one. Suburban carry (I call it non Work carry), 950 offers more substantial blade. It has wide belly that makes very confident in cutting work.
I hope this helps you with selections.