I've been using a a 70's V4B head that weighs 70lbs or so. Great stuff, but I need something a bit lighter and more power. I'm going to start a new rack to power an Eden 210XLT and a 112XLT. So I need about a 600-700RMS@4ohm bridged power amp. I don't even really know where to begin looking. I also need a decent preamp. I really want a low-mid smooth growly sound. I'm not sure how possible that is with my Rick 4003. I was thinking an Ampeg SVP-Pro. I want something I can DI to a PA system too. I'm trying not to break bank here so keep it all under about $1000 or so. I might try to buy stuff used. Any recommendations?