This is probably the best version of this question in a long time.... I know one of them would be Bell's Two Hearted Ale. It's funny I had just posted yesterday on facebook, that I was brewing an IPA (my clone) because no matter how much beer of different types I had around the house, homebrew or otherwise, I still crave Two Hearted Ale. So I either need my clone on tap or I run out weekly for some. I never tire of it.
Now the other one is trickier. I want something that I wouldn't tire of eventually which I would most any because everything else I rotate whether it's buying or brewing. And it can't be an extreme style, like a Barleywine, since an IPA is extreme in a different way.
I'm thinking it would have to be something of the lawnmower/cream ale variety... of course you never said anything about additives....I could just choose PBR, and add this stuff to it.
Well are we talking about a warm tropical island or a chilly more northern island because that makes a difference. I will assume a more northern island.
Surly Furious and Widmer Drifter Pale Ale. It would also be nice to have a good Oatmeal stout but I can't think of a good one if the top of my head other than Samuel Smith and Tallgrass Buffalo Sweat.