I am a beginner bassist and looking for amp and cab that will be able to be played at small to medium gigs eventually. I play heavy rock/ metal and have a 5 string bass. I am thinking about getting a behringer bxt300 head and this cabinet: http://store.steelsound.com/Detail.bok?no=1413 but a friend of mine who is an accomplished signed national act musician tells me i should use 15's. I was just curious on some feed back on what people on this forum thought about the 12's and what the differences might be. Thanks! P.S. I have no interest in the sound of tens!