I bought a clean good used Fender Blues Jr, and in the process of giving it the BillM mods. I plan to extend the cabinet downward and make it a 2X10. Suggestions on two different sounding/playing speakers that would compliment each other? Would two 8 ohm in series or two 16 ohm in parallel be better? Suggestions? I will recover the amp in forest green vinal w/tan grill cloth and tan pipeing.