What do you all recommend? I would like to keep the cost to a minimum, but want a good quality gun. I am new to AR guns, with little to no knowledge concerning reputations of them (have only looked at Remington R-15, DPMS and some Smith & Wesson models) and would appreciate any input. Looking to get one with birthday money in April plus whatever else it will take through saving up to get one. Thanks in advance for your help!