I don't like the Flor de Cana, but I really like the other two. The Diplomatico is what got me into rum. El Dorado 21 is amazing as well.
These are excellent widely available rums to try.
This is my current top shelf in my liquor cabinet. The cheap stuff does not get laid out so nice.
How is the Kirk & Sweeney? Can you compare it to anything? I look at that one alot, but have never pulled the trigger.