Depends on how much you want to spend, and how much you want to drink. It also depends on what you can get at the liquor store. My favorites are seldom available in Iowa, unfortunately.
I avoid pretty much everything from every American Macrobrewery, save for Michelob and sometimes Sam Adams, if I actually want to enjoy beer. If I'm just drinking to drink (ala camping etc), you can't go wrong with Natty Light. It's cheap and most American Lagers taste pretty much the same.
The problem with Sam Adams is that while their beers are good, they aren't great, and if you're going to spend Microbrew money on beer, you might as well get a good, local Microbrew.
At any rate, Bell's Oberon Ale is a nice, smooth drinking wheat ale you should be able to find around. I guess I'll recommend that.