For exactly $200 you can get a newly released Lucid HD7 gen III. In my opinion the only optic in this price range that i would consider truly shotgun proof.
It also has some features not available on Aimpoint, Eotechs and other top red dot sights, such as auto brightness regulation, 4 changeable reticles and screw in magnifiers.
http://www.mylucidgear.com/reddotsights.php
Reviews:
http://www.thetruthaboutguns.com/201...red-dot-sight/
http://www.riflescopes.webyshops.com...D7-Review-From
Note: the new Gen III addresses most of the shortcomings of the earlier models with better turrets, screw in killflash etc.