1/2 oz Benedictine
1/2 oz Velvet falernum
1/2 oz Becherovka
1 shot white rum
1 dash Angostura bitters
on the rocks

Excellent! Maybe a little on the sweet side*, I might try bumping it up to 1/2 shot Becherovka just to see what happens, but the flavor balance is very good. This may taste even better with an aged rum (I want a bottle of Montecristo 12 year, that stuff is amazing), but it's damn good with a white. A cherry seems like the right garnish.

I need an alcomahol icon.

*I doubt you'd agree, merri_chan. It's drier than most of your creations, though I doubt anybody would accuse it of being dry.

EDIT: 3/4 oz Becherovka is indeed superior. This is a definite winner. Still haven't tried aged rum (due to limited shelf space, I still haven't gotten any).