ok, have a question. I have a bfx50 crate amp which is not bad at all but not big enough since I'll be putting together a band in the next 2 months, so I want to get a good amp but I hear everyone talking about cabs, power amps and crap like that and I'm just confused. (i've only been playing for about a year so I don't know much about gear) do I need a combo amp or a cab and head amp or what's best? how big? 120watts be ebough? please help and explain the pros and cons of each. thank you.