Have you looked at any of the production collaborations to get some basis for what you want out of a knife? I mean, there are countless custom designs out there that might fit your preferences, but you can probably narrow down a few designs or designers by checking out collabs. I'm partial to RJ Martin's designs, and although I haven't taken the plunge into custom knives yet, I'd probably start with his Avenger. I have always liked CRKT's Hammond Cruiser and have a couple of them, and Jim Hammond's Cruiser MV looks sweet. I don't know if the Boker Plus Kalashnikov 101 is an in-house design, but something of comparable size is about as big as I'd want to go with a folder.