By the end of the year sometime, i want to invest in a stronger amp, and i've already owned 2 combos and i want to make the switch to stacks I own a 100/120 Watt swr combo As far as musical equipment goes, I'm a little clueless sometimes! Buuut, latley, at my dayjob, i've been researching on the net on how to set up these head/cab things -- meanwhile, i'm getting paid (Shhwing!) soon i will have saved up to the quadruple digits to go towards new equipment, plus, i'm planning to sell my elec guitar I'm in a trio, sometimes quartet, with some pretty loud, envangarde dudes. If i bought, oh, say a 250 watt head wtih a 1x15 150 cab, would i only have 100 more watts reserved for expansion? What are ohms?? Basically, my questions are -- What is a good head unit to start off with, and what are ohms?