Any 2 year old or older tom is a good bird in my book, once you get up to 1 1/4" or better spurs you are getting toward a great bird (at least here in NY).
A beard can break off, and weight is highly variable depending on region, how late in the season it is, and how much of a fighter the bird is. If you get a bird with some serious hooks though you know it's an older one, and that's what I really like.