So, I currently use a Genz Benz GBE 250 watt 12" combo. The tone of the amp by itself is pretty good, very strong in the mid range and lacking in the low end. Very neat amp, however it is just not what my current band calls for. Volume is not really an issue, but I do need to fill a lot of space sonically and this amp just isn't cutting it. I play with an acoustic guitarist, banjo player, and reasonable drummer and play small and medium size venues, usually with PA support. I generally use the line out on my amp into the pa, and just use the amp itself for stage monitoring. So, I'm looking for something strong on the low end, with a full sound. I'm not adverse to either a combo or head/cab set up, however I would prefer light-weight gear and an upper budget of around $700, give or take. I have no problem buying used, however the used market around here sort of sucks. I'm also not really brand-loyal. I mostly use a passive jazz bass with few/no effects. I've been thinking about trying to pick up a used Ampeg PF500, but I am not sure what sort of cab to match it with or if that amp will help achieve my goals. I think I've covered just about everything. Any thoughts are greatly appreciated.