Wasn't sure which section to post but here goes: I know there are threads that touch on AR optics, but not specific enough. I read articles and such on optics and they mention things like MOA, Red Dot, Mil Dot, reticle, variable, monocular, etc. Here's the gun I have coming: http://www.dpmsinc.com/firearms/slideshow.aspx?id=7 It'll be used for for mostly home defense,varminting and maybe eventually some competition.I'm figuring on a range out to about 300 yds. What is an appropriate, economical optical set up, and what are the differences between the things I mentioned above. Thanks in advance.