Ok, I'm a college student on a college student's budget. I'm hoping to go into the police force and would like to have to experience with an ar before joining, not to mention that the guns are awesome. I've been looking at a del-ton upper thats 400 and a plum crazy lower at 120. Anybody have any reviews on those 2 or any suggestions for me? I would even be ok if you knew of some used. Thanks for the help.