Id really recomend looking into a cybershot ... ive tryed some of the other brands which arnt bad but not quite as good .. i think you can get a 5.0 cybershot with the zies lens for about 7-800 right now it was over 1,00 when i got it almost a year ago. The zies lens is like comparing aples and oranges .
For example a tasco scope will do what you need it to do for about $150 but anyone who wants to see the hairs standing up on the back of a gophers neck at 800 yards would gladly pay an extra 3-400 more to get a Zies or leopold scope. I always figure why settle for a step down when your already investing anything over $400 might as well get what you want .
Just my 2 cents. Anyhow look into one they are extrealy sharp.