Wild Turkey 101 on sale for $21 at our local stores. Or grab an Evan Williams Single barrel for a couple bucks more not as high proof but damn good bourbon.
The first thing that comes to my mind is WT101. But I guess it also depends on what you like in a bourbon. And somewhat on what you are "mixing" it with. WT101 has a high rye content.
i usually mix it with something like coke,in terms of what i like.wild turkey's 101 proof has always been pretty good,so has evan williams white label and jim beam