Here is the deal I have a 450watt @4ohm solid state head and was wondering about headroom? I have a 2x10 8ohm cab 500watts rms and want to add another 8ohm cab. 1x12 250 watts rms or 2x12 500 watts rms, and I don't want to tax the head, be under powered or over. so what is best 750 watts rms 2x10 1x12, or 2x10 2x12 1000 watts rms with my 450watt @4ohm head. any answers? I want to try to stay portable but be able to play with two guitars with half stacks. small,medium,large gigs, but want what sounds best out of these two combinations thanks.