Take a good look at the new Cabela's Instinct Euro line. Simply amazing optics in your price range. Full lifetime warranty, made by Meopta, great scopes.
Aside from that, I'd get into a Leupold VX-3. Contrary to what has been written, the Viper line does not stand up to the VX-2 or 3. The Viper isn't bad, just not what it's been talked up to be.