Hey guys, this is my first time posting. Im in the market to upgrade my amplification. I just bought a Mesa Boogie 1516 Cabinet from a friend for $400 and now I need an amp to go with it. This cabinet has a switch to go from 4 ohm to 8ohm and is rated at 400 watts at 4 ohms. I've been looking at Genz Benz but what model should I go with? I would like something that I could possibly upgrade my cabinets with later (add more cabinets for example) so I don't mind going overkill and just playing at low volume for now. Your thoughts?