Find a knife you like and spend $30 - $40 on a custom clips from STR (on the forum in the Knifemakers section)
http://strsbackyardknifeworks.blogspot.com
As long as the knife is drilled and tapped, STR can make you a superb deep carry clip that makes the knive invisible. This way you are NOT restricted to SOGs or particular brands as long as there is enough spacing between the clip holes. Anything with a wide 3 hole style like Emerson and Benchmade is fine.
So if you wanted a Spydero Paramilitary 2 with a deep carry... STR is your man.
I got a Gerber Applegate Fairbairn (full size model with 5.5" handle!) done and it rocks!!