I've always been a Pusser's man myself, even though I know it's not the same as the original Navy Rum issued by the Royal Navy. Pusser's has a delightful page on their web site about Navy Rum folklore that's worth perusing if you're a rum rat:

http://www.pussers.com/rum/folklore

I still use a Pusser's tin mug at the Games...

For mixing Cuba Libres, Cruzan makes a nice Estate Dark Rum. My wife used to live literaly just down the road from Cruzan distillery on St. Croix, btw. I still need to try their Black Strap rum...

Splice the Mainbrace!

Todd