Alright. I've changed my post because I've narrowed things down to two models. Either the AA model or the N battery models. I have no need for NVG stuff, so I don't think I need the 550 series stuff. However, I do want the Rev. F raised rubber buttons for faster use. I can spend $265 MAX shipped for a well used but well cared for EOTech sight. Please contact me at Nick Ras @ cableaz . com (omit spaces) or IM me with any info. Thanks!