Hi, im planning to buy a Sansamp PBI pre-amp and Behringer EL1500 power amp. I know its behringer but im poor. I need something like a 4x10" or 2x10" and 1x15" speaker setup. However i am confused by the power amp outputs and impedence etc. Which speaker cabs (models, manufacturers) for around £350 would be good for this rig, and how would i connect them up. Thank you for all your help.