If you've never tried Kona coffee, Aloha Island is definitely the one to start with. Kona coffee is grown in the Kona district of the Big Island and regarded by some to be the best coffee in the world. I'm not a coffee aficionado by any means, but you can taste the difference with Kona coffee - it's full and rich and almost mocha-ish. I always reserve Kona for lazy weekend brunches or to serve with dessert after a lovely dinner.
Aloha Island operates the only quality management program in Kona, so their coffees are certified as 100% Kona. Which just means that you're guaranteed to get quality Kona coffee if you order from them.
Keep in mind that Aloha Island has three grades of Kona coffee that they sell - gold, platinum, and diamond (which is supposed to be their private reserve). Obviously, it gets more expensive as you go up the ladder. The gold is very good and a great place to start sampling their fare.