My favorite is my Dalton M6 Tanto. It is an out-the-front (OTF) auto. If you are a fan of auto folders, Daltons are the absolute best. The only bad thing is that buying them is extremely addictive and they are rather expensive. (I know guys with collections of over 200 Daltons).
Go here if you want to see a collection of just about every Dalton ever produced:
http://mywebpages.comcast.net/km4yk/Dalton.html