If I was reasonable, I'd just stick with 4R for now. Great bourbon for the price.
Might even be changing my avatar.?.?
I'm a fan of the 4R as well. I'm relatively new to bourbon but yellow label is one that I keep re-buying. I've gone through a 2012 Limited Edition Single Barrel and bought another as well. I haven't opened the 2011 and 2012 Small Batches yet (only because I'm gifting them to my gf for Christmas), but I heard they are fabulous.