Moose,
I'm not entirely sure why you're looking at Auto/Assist models, but if I may, let me toss a couple of thoughts at you. First, I've killed the assists on no less than 3 Kershaws. They make fine tools, but the assists hardly lasted me a week of break in. That was on 2 Ken Onions and 1 Blackout. If you are looking for a fast open look no further than most anything that is not Auto/Assisted. I can one-hand-open a good folder much faster than any auto or assist I dare say. Plus, when you travel across state lines and even sometimes within states (in certain cities for example) you can wind up carrying a now illegal blade. Autos especially are unwelcome nearly everywhere. A 3" or slightly sub 3" knife while not the coolest kid on the block, (definitely wont get attention from mall ninjas) will be plenty useful and also wont garner much (any) attention from the PD.
I have to agree with your decision not to go line-lock. I had one close one me once when I had to do "the twist." I now carry a Delica 4 (love it, whish I got it sooner, woulda saved me money on several other knives). If I were to go with any other mechanism, I'd have to go with a BM Axis. I'm not sure but I think the Manix works on roughly the same principle, but I'm not sure (can anyone help me with that, or is it just an Auto knife?).
God bless,
Adam