Victorinox Soldier/Pioneer, by far the best with it's much beefier tools and the awl of awesomeness!!!
Wow! My list of SAK's that I "need" has grown considerably. I like this thread. And please feel free to tell why you like something. Like Larry said, it's YOUR favorite. I'm in love with the Cadet and I'm very quickly falling in love with the Executive for every day EDC (yes there is a difference ) I'm also pretty partial to the Recruit.