i don't see why you couldn't use the grape fruit juice to add a bitter flavor to beer instead of so much hops.
i agree with the bud light lime comments and most of the leinenklugels. but i actually like the lieny oktoberfest everything else can go.
i especially don't like their shandy. i mix my own with GI 312 and carbonated lemonade (about 50-50)over ice. damn refreshing on a hot summer day. oh hey, its hot here. time to pull this one out