These are all what I would consider sipping rums, things you would drink with some ice and not necessarily with any additive (cola, soda water, etc).

Is that what you plan ? If not, I would not spend the extra money. And Gosling is dark, sweet rum. It is not a spiced rum (think Captain Morgan). Some people dont like dark rums because they are too sweet. Example: You drink a white Barcardi and Coke with a lime, but in most instances you would not serve a lime with a dark rum and coke. The lime would counteract the sweetness and the intended flavor.

As for the particular rums you listed, I have had the Gosling and Pyrat. Either are fine choices (buy the Gosling if the price difference is not a concern).

If you just want a fine, drinkable rum, the regular Gosling Black Seal is a superb value. I also drink a lot of Myers which is a dark sweet rum (also available in a white rum). If you have not noticed, I drink a lot of rum in general

Cheers.