I'm wanting to upgrade from my 2x10 cab(4 ohm) to a 2x10 and 1x15(both 8). I don't have the most cash in the world, but I am willing to spend a decent amount for a new rig. I currently use the Behringer BX3000T head(300w @ 4 ohms). Also, would this route be any better than getting a 4x10? Thanks in advance for any advice.