TexasCHLforum.com

You can run a red dot and scope combo. Leupold makes the HAMR, which is pretty awesome, and their are offset mounts for micro reflex and red dots you can use. Its expensive, though. A cheaper option is to run a scope and offset iron sights for your close shots.

^
+1 for Primary Arms. Good guys with good prices. Their PA branded scopes are a huge value for the money. Their magnifiers are awesome as well. Their PA branded red dots are good, although they do not have the durability of the major players.

If you are looking at a red dot, the Aimpoint PRO is probably the best deal around for your price range. 2MOA dot, NVG capable, ridiculous battery life measured in years, Aimpoint durability, and ti comes with a pretty good mount. You can easily find the PRO for $400. EoTech is another option, especially if you prefer their reticle. IF you go the Eotech route, absolutely shop at Primary Arms. Their Eotechs all come with a free Primary Arms magnifier and mount. As I said above, that magnifier is awesome. I could not tell a difference, side by side, between it and the EOtech magnifier.