You will definitely pay a substantial nostalgia premium for a Cub. It is kinda cool flying along with the door open but eventually you will tire of that and want to close it and well, pretty much everything else about it other than the being open part sucks. I learned to fly in a J3 so they have always held a special place in my heart but about ten years ago I stumbled upon a 90hp 7EC Champ for less than half the price of a Cub and bought it. I've found it quite similar in form and function to the original 90hp Supercub with a bit more room and comfort. There has always been a sort of a team loyalty thing between Cubs and Champs that probably depended on which one you learned to fly in and I honestly was always a Cub guy who hated Champs even though I had never flown one.
Now I like them both. They have their subtle differences and both may be easy to fly but they aren't necessarily easy to fly gracefully, it takes some time to master all of the quirky nuances of each.