I guess if I don't comment everyone will think I have passed on....ha
OK, First off what kind of knives do you have now. Do you want something like them or something different. Do you want just a couple of knives to represent the series in a sort of personal collection or do you want a user for carry. What type of scale materials do you like. Do you want something new, cheap as possible or are you willing to search for a discontinued model ? These are all good questions.
Go online and look at catalog, does anything in the model series strike you.
I would say the all around classic design 300 series is the 301, a three blade stockman not unlike many other manufactures versions of the classic stockman knife. The 303 is a smaller version. After that it just up to what you like. Like Stumps and his long thin two blade trapper, a discontinued classic in black sawcut delrin. Seen for sale pretty often on a certain auction site.
Look at some pictures and see what you are drawn to.
300Bucks