Every time I'm looking for beer I always try to find something different that I haven't had before. Because usually after I drink it I can give it a rating, and a review if I feel inclined to do so. Although when on a hunt to try a new beer I tend to peruse the aisles for about a half hour before I'm happy with my selection. lol!
The higher the abv %, more exotic, or flavorful the better. You can still find good low priced beers, just have to keep an eye out for them. The lowest price with the biggest bang for the buck I have came across has been Mendocino brewing co. I've been able to leave the store having spent only $7 on a 6pack that is 8 or 9 abv. Awesome! Not the best beers around, but they aren't bad either.
Also... Dogfish Head.. mmmmmm