I'm looking to upgrade my factory system in my 2004 Q4 Tahoe. Probably a good head unit with pre-outs, amp w/4 speakers, sub (or subs) with a mono amp --- maybe upgrade to additional tower speakers in the future. I won't play CD's so the remote box units like the Kenwood KMR-700U http://www.crutchfield.com/p_113KMR700U/Kenwood-KMR-700U.html?tp=1721 have my interest. I'm a DYI guy and would like to do the hook up and mounting myself but my last go around with car stereos was in the late 80s. Technology has really advanced since then. My question is, where is a good place that a guy can read up on audio systems to understand what to buy, how to properly size the equipment for my application and how the wiring & system functions? I like to understand what I'm doing so I don't f*** it up. I've been to a few local car stereo shops and they all treat you like you're an idiot and just want to sell you an install. Thanks!!!