Although I intellectually prefer modern lock blades for actual use I still have a drawer full of traditional slip joints. There's just something about them!
In terms of pattern, I have to say my favorite is the large Trapper. It's big enough to use for a lot of everyday chores, has a nice selection of blares and isn't too big or bulky for pocket carry. Of the 8-10 Trappers I own, this on is probably my favorite.
It's a Case knife with Red Stag handles. Supposedly Red Stag isn't as durable as Sambar Stag but I love the warm, reddish color.