Originally a guitar player, the only bass amp I've bought is a Ampeg BA-110 from a pawn shop and am pretty ignorant when it comes to equipment. The Ampeg was great for starting out, but now that I'm gigging frequently, I'm looking for the real deal. I dont even use my Ampeg anymore other than a stage monitor, and at practices I just run direct into our PA. When I did use the Ampeg, I usually had the tone setting on 1 or 2 to get the more deep low ends. Im looking to really make the place rumble with smooth, warm, lows. Im looking to spend between $600-$1000 on craigslist or something, I just need to know what to look for. im pretty set on something rack mountable that I can add on to. any advise would be appreciated!