Maker's Mark is a pretty good mainstream bourbon. Wathen's bourbon is excellent, and not terribly expensive. Another very good, reasonably-priced small-batch bourbon is Elijah Craig; it is probably a "best value" -- (in my opinion) it's just shy of Wathen's in taste, but over $10/bottle less in price. However, both Wathen's and Elijah Craig are much harder to find than Maker's Mark, which you should be able to buy anywhere.