I'm in a thrash band and we will be releasing a little cd in a few months. For that recording I will run my bass through an Ampeg SVT4 Pro and 810E cab in my Ampeg modeling software. However, over the summer, we plan to gig as much as possible. So I need an aggressive sounding head in my price range. I also need to keep up with a 50w or 100w TUBE guitar head and a drummer. Possibly another guitar amp, but not sure as of now. I plan to run it through an MXR M-80 Direct Box. I am not willing to spend over $750. Here is what I'm considering: GK 1001RB-II http://www.guitarcenter.com/Gallien-Krueger-1001RB-II-700-50W-Biamp-Bass-Head-102294733-i1145841.gc Behringer BX4500H http://www.guitarcenter.com/Behringer-BX4500H-Ultrabass-Bass-Head-103311015-i1145507.gc Warwick Profret 5.1 http://www.guitarcenter.com/Warwick-Pro-Fet-5-1-500W-Bass-Amp-Head-483063-i1321018.gc I am making a trip to Guitar Center this Monday to try some amps out. I am asking now to get some suggestions as to what to try first and what to buy if they happen to have a bad selection. CAB QUESTION: I have a custom built cab that has 2 horns and a 15-16 inch subwoofer. On the back it has an input jack and an unlabeled switch. I was wondering if I could find out the wattage somehow (it is nowhere on cab).