Hmm, I seem to remember a Monte Python joke about making love in a canoe. Sadly, not DIS-friendly
Anyway, keep in mind that Ultra isn't beer - it's beer flavored water for dieters.
There are tons of Great American Beers. Most are regional, so it's tough to make a recommendation. Go to good bars and trust your bartender. In general, I think the craft brewers are doing their best with IPA's these days. I'll take a local craft beer over almost any mass market beer.
But if you want a mass recommendation - or you get stuck in a bar that restricts itself to the mass brewers, Sam Adams isn't bad. Right now they have a summer ale that's pretty tasty.