I spent in the $600-700 range for a Cabelas big sky HD 20-60x66mm, I love it, super clear etc....for the money hard to beat without jumping into that next bracket of thw swaro's etc....

read somewhere else on here guys talking about the higher end nikons.....used on ebay etc....

For the money though the one I bought I felt was the most bang for the buck. They also make a 27-80x or something like that, with a 80mm lens or so, don't think you need that much magn. but the larger lens would be something to consider.