Welcome to the forum. The question you ask has hundreds of "right" answers! What's the right knife for one person is different for the next. My favorite Buck is the 110 but I seldom carry one, especially in an urban invironment. Of course, I'm retired and don't really use a knife for any type of real work.
A 110 is a great knife but in my opinion isn't a "pocket knife" and is best carried in it's belt sheath. The smaller 112 may work better for pocket carry for some, but it still makes a big lump in my pocket and when carried always goes in a belt sheath also.
The Vantage line may just be the ticket for you if you are looking for a single blade, larger knife that carry's well in a pocket with the pocket clip. They are available in two different sizes and several versions, plastic, paperstone, Dymondwood and G10 handles. They also come in three types of blades, 420HC, 13C26 Sandvik and S30V. They are probably the best value out there for the money.
My personal favorite for EDC and one I never leave home without is the 301. For me, it's the perfect size to carry. You will just have to buy several

D) and see what works the best for you.
I'll now turn this over to others. You will more than likely get just about as many different answers as you will get responses. That's the beauty of the Buck Knife company, there are so many great choices, they can just about please any taste in knives.:thumbup: