I know this has been discussed to death here and at arforums, BUT i need some optics suggestions/reviews. I cant bring myself to spend the hi$ at this point. I am thinking SPOT. But anyone used the Bushnell Holosight? Or SPOT for that matter that wants to give a personal review? Or anyother inexpensive suggestions from personal experience? Or maybe in the end i will just give in and drop the jack for an EOTech or AP. But any input at this point will help! S&W M&P15A by the way.