Hello everybody. I am planning to buy GK 400RB-IV (280W 4Ohm) head, and Ashdown ABM-414H (650W, 8Ohms, 4x10") cab. Will this be a good combination in terms that I want enough sound to play at small-medium gigs? Sometime in the future I'm planning to buy Ashdown MAG-115 (1X15, 250w -just to get more low end). I'm not sure if the head is powerful to get the job done.