To add, I suggest all new to traditionals hit up flea markets, pawn shops, antique malls etc and actually handle a few Slipjoints to see what you like. Don't count things like stiffness of opening/sharpness but use your time in hand to see what feels like the best pattern for your uses. I've found that Trappers don't do much for me, personally. I still own a couple of renditions but when I "coon finger" them at shows and such they tend to leave me flat. It's okay to not like patterns as well, some just don't fit our tastes. The Canoe gets little acclaim here, although it's a great pattern. If you find a gem, snatch it up! Some of my favourite knives were sub $20 antique store/show finds! If you find nothing on an afternoon out, at least it's an educating day, and I personally like the ambiance of said places so it's a nice afternoon out.
Stockman and Whittler compete for me for my favourite pattern, so I do think that it's a great choice for you. I would suggest trying a model with a punch secondary when you do try the pattern. To me the punch adds a lot of versitility to the pattern, as you have a tool along with a longer and smaller blade, and from what you wrote you should be content without the third blade. I find the punch to be a tough, useful shape to have around as general awl/light prybar/poker/abuse tool.
For a first stockman bought new unseen the case medium with California clip, sheepsfoot and punch with bone handles is a great starting point in my opinion, and I'm not the biggest fan of either Case or California clips. But the knife does speak for itself.
Are you familiar with the fact that perfect grinds and sharp blades aren't exactly the norm in new traditionals? Some work is usually warranted, in both cleaning up the knife for smoother action, as well as sharpening and often re grinding some edge.
Here is a sample of what I experienced- the knife I suggested is included.
http://www.bladeforums.com/forums/showthread.php/1153888-An-overview-of-nine-new-slip-joints
Good luck on your search and please keep reporting back.