Mount Gay Eclipse is nice but not dark enough for me. It’s a very nice rum if that’s all that’s available, and many times, that’s it.
If you like dark rums you gotta try Black Seal. Literally black rum that’s perfect for sipping or mixing. Dark ‘n Stormy. Heavenly 😎
Eclipse is a great mixing rum, but Mount Gay XO is a better variant for sipping neat or on ice.
El Dorado 15 is excellent too, as are Zacapa and Barbancourt. For the really funky Jamaican variety, Hampden Estate is tough to beat.
I generally avoid spiced rums, but Plantation Stiggins' Fancy Pineapple rum is worth adding to any bar.