Hi, i have a 90 Cutlass with Infinity 9613i 6x9s, and a 12 inch Infinity 1250 watt 4 ohm sub. I was wondering what kind of amp i should get? Mono channel or multi channel? Also what type of wattage should i get? I am new to the car audio industry so all advice is helpful. Also i would like to spend no more than $200 on the amp. What is the best brand of amps. I was thinking of gettting a 1200 watt 2 channel Sony amp. Are they good? Thanks