http://www.snipercountry.com/InReviews/SpottingScopes.asp
A comparison of scopes less than $600 is done. Kowa 612, Swift Panther, Bushnell Spacemaster, Burris Signature, Nikon Spotter XL, and Leupold Wind River are put through a through test. I just placed an order for the Bushnell SpaceMaster #78-1821 20-45x60 (LER) with the OPTIC ZONE (very good prices). The new SpaceMasters are fog/water proof with a "Rain Guard" coating, the older #78-1817 and #78-1217are not, and I really like the rear focus.