I am in Haiti, but have been spending some time in the DR and have been trying the Brugal and Barcelo rums and they are pretty darn good. Barbancourt from Haiti, the 4 year old didn't strike my fancy, but where I am in Haiti I haven't been able to get any of the better bottles.
Brugal "Siglo de Oro" is a very good rum, a bit on the sweet side for me. But very good.
I have never seen too many Dominican rums in the states, maybe a Brugal once.
The Barcelo "Gran Platino" white rum is very good for mixing, right up there with the FDC Extra Lite, although I like the FDC Extra Seco a tad better.
One note I am not aware of, or at least I have never seen it and I lived in Nicaragua for almost 9 years, that FDC makes a 15 year old rum. Is that a new rum or maybe for export only. Flor De Cana, the 12 year old is a great well priced rum and the 25 year old is still my favorite high end one, just slightly better to my palate than Zacapa XO.
I have only had El Dorado once, and I wasn't paying good attention. Is it fairly available in the states? I have only seen it Panama and didn't try it.