Cruzan 9 specifically for me. Their other varieties aren't really my thing. For the record, folks, we're talking SPICED rum here. "Silver" varieties are not worth your time unless you're mixing them with fruit juice or making a pina colada. For instance, Captain Morgan's parrot bay has one of the best bottle designs in booze, but tastes like flavored sugar sludge. Not really a BAD thing, and easily drank straight from the bottle, but only if you have your insulin handy I imagine.
Kraken runs about 20-22 bucks a fifth. Really nifty bottle and while you're drinking it, peruse their website for some real nautical fun. If you buy it and drinking it straight turns out to not float your boat (yarr, rum), it mixes just fine with cola, though not as well as a Cruzan.
IF you're really slumming it and want to go as cheap as you can, you can do worse than Ronrigo. A bit like Jerry's with a shot of hairspray for good measure, but gets the job done if it's mixed liberally. I can't in good concience endorse Admiral Nelson, despite being named for a great man whose life and afterlife were surrounded by rum.
As an aside, I once tried to make up some grog, which for the uninitiated, is seawater and rum, occasionally with additional spice or sugar. Believe it or not, rum and saltwater is not the worst combination ever. Beats vodka and coke in my book.
When.