Okay, just a first comment since some people seem to think Glasgow_kiss is looking for a knife to use in regular reverse grip. Edge-In reverse grip holds the knife backwards, with the edge INWARDS, instead of out.
Despite arguments, I think this is the BEST way to hold a defensive folder, for close combat... or at least the best reverse grip, as situational factors, including time and what you cand o in that time, may require saber grip, or make only that possible. But, its still nice to see someone else who likes edge In reverse grip. I really think its superior, and its a grip that doesnt put stress against the lock of the knife, during use, all force is against the stop pin, and not the lock.
If you can find it an old Kershaw Talon hawkbill folder would be GREAT for edge in, altho the blade is a bit short compared to others suggested.
Of knives I have experiance with...
The Emerson Commander, great shape overall. I carry one daily. And it does work in Edge In, grip might not be perfect, but it really does work, and its not uncomfortable, not painfully so.
Emerson CQC-7a (or B, I just kinda preffer A, the spear point), is an EXCELLENT! folder for Edge In reverse grip. Feels great. I dont think you could go wrong by getting one.
I dont know if thye are making the A model with a wave, but if you dont mind a B model, get one with a Wave... its an excellent thing to have for an Edge In folder.
With a Waved folder as you draw the knife from your pocket,t he Wave catches, and pulls the blade open... from there all you have to do is the simple motion of rotating it downwards, axis of the pivot being between the thumb and forfinger you were pinching the knife with to draw it. This rotates it right around into the hand... the handle into the hand that is, the blade stays safely out of your hand. Done this a lot of times, it works great.
The other thing is, this takes less fine motor skill, than working your hand up into a solid saber grip, or pivoting and rotating the knife in the hand, for an Edge Out reverse grip.
For a pictorial on this draw, and getting the knif einto grip check out this thread
http://www.selfdefenseforums.com/forums/showthread.php?s=&threadid=1294 its about a different knife, but the concepts apply all the same. Great thread for anyone into Edge In grip.
As for lock-backs... I actually do carry either a Spyderco Endura or a Delica, which I modified with a Wave and a Boye detent in the lockbar... witht he intention to deploy them as Edge In tools. I am not overly concerned with the lock failing, since I ground a boye detent into the lock bars. It seems pretty safe to me, in my training. And no pressure is applied to the back of the blades, in Edge In use, only pressure against the edg, which pushes them back into a full open position if they did come un-locked. But really, I am not concerned.
For more details on my mods to them, look
here.
Another one you might wanna look into, would be the Gerber Applegate Fairbairn folders... looks to me like they might be good for this grip. And they are pretty "stabby" too.
A Spyderco Harpy might also be a cool choice for Edge In grip. And i dunno how the handle would be, but I think it would be comfortable, an Emerson P-Sark would be an option too.
My first choice though would be a Waved Emerson CQC-7, or a P-Sark.