I am trying to decide which head would be better for me, the V4b or an SVT. I recently bought an Ampeg 810 and I am currently using a Marshall MB450h head with it. I play in a rock band with 2 guitarist that both play 100w Marshall halfstacks with their volume around 9 O'clock. I like to have a bit of dirt in my tone and usually play with an OD pedal on with just enough drive to give it some hair. I'm thinking the V4b should start to break up a little bit at practice volumes but I'm worried that it might be underpowered at an outdoor show where we get to open up the amps a bit. Do you guys think the v4b will work for me or should I just go with the svt to be safe? I've looked at countless threads on here discusing the two and still can't make up my mind on which one to go with. Thanks!