Well, if it's smoothness you're after, you could always try the 2006 George T. Stagg 140.6 proof, if you can get and afford a bottle. If you're looking inexpensive, try Eagle Rare 10, or Baker's. To tell you the truth, Booker's is smoother than ever, but it's being released at a slightly younger age, and lower proof, which has affected the body and flavor in ways I don't care for. Also, try the Old Forester 2006 and 2007 Birthday Bourbons, or the Four Roses Single Barrel. The others in that line might be nice too, but I've never had them. The two you mentioned are fine as well.
I would suggest trying Wild Turkey Russell's Reserve Rye also. If you can afford the Thomas H. Handy Sazerac Rye, try that as well. Good rye is smooth, with a little spiciness, somewhat candy-like. Great rye is complex, spicy and full of candy-like flavors.