Everyone has their own criteria and personally I have not yet owned what I consider to be the ultimate EDC, but I'm still looking.
I've owned and carried a lot of Benchmades- AFCK's, Leopards and mini-grip. The mini-grip is a pretty good knife although I've decided I want a larger blade now. I used to dismiss anything that wasn't tip down but I learned that the mini-grip is short enough that it can work tip-up. I'm afraid that larger knives still won't work though. I've bought a PM2 to try for EDC but haven't gotten enough experience with it to judge yet. I also carried an EDI Genesis II for awhile and I thought it was pretty good. But each knife I've carried still had one or two things that kept it from being ultimate in my mind. Right now I'm eyeing a BM 913 as perhaps the ultimate for my criteria, now I just have to find one that I can afford and try it out. The 890 and 943 also satisfy my criteria to some extent. The 525 and 581 come close. I might like the 710 except for that bit of recurve and the clip being on the wrong end.
I spotted the 707 and I like the design, but I find that it is just an upgraded mini-grip which is both good and bad. In its size range though I think it is pretty good.
My personal criteria:
3.4"-3.6" blade, plain edge, keen point
sculpted G10 handles
liner lock or axis lock
steel that is better than 154 or S30V
tip down carry
I had to come back and add this part...
I think for lots of us the ultimate EDC does not exist. As we buy new knives, other things will come on the market and looking for the ultimate will always be chasing a moving target. I think this is OK because this is what keeps us engaged in this hobby and makes the chase the rewarding part of what we do. Progressing down the road and finding better and better knives to buy is what keeps us going. I could have stopped with my first Benchmade Leopard, pronounced it the ultimate, and never bought another knife, but none of us want to just stop the search.