I second the Burris XTR line. I've played with the 1-8, 2-10, 3-15 and 5-25. They are Philippines knock-offs of the Steiner Military series (which are AWESOME!), have great controls, usable reticles, and are definitely a good bang for the buck. They don't look like you're looking through a paper towel roll like the Vipers, either. Don't get me wrong, I love Vortex, but only if it says "Razor" on it.