Well, my beer of choice is Guinness, especially if you can get it directly in Ireland. More creamy. They have to pasteurize it when it comes into the US, and it's not quite as good. For something a little lighter, Smithwick's will do the trick as will Stella. There are some really good off the wall beers here too, and I'm not a fan of American beer...hate Bud, Miller products...they're made with rice and it gives me a headache. Besides, they taste like dishwater...wait, no, not that good.
If you have the chance try some of the beers from the Alaskan Brewing Company. The Alaskan Amber and the Summer Ale are very good. My favorites are Moose Drool, Trout Slayer, and Slow Elk, from the Big Sky Brewery in M0ntana. Moose Drool is a great choice.