I am looking for the best / most reliable 13 Seer AC compressor unit on the market today. This is needed for a 3.5 ton home AC system. I am getting bids now and the first company wants to install a Lennox 13ACX. With a little Web research I see that this is the lowest quality unit that particular company offers. Not what I am after. I am willing to pay money up front for a quality unit that won't need repairs. What say the Mud HVAC experts?