I have a 3500 Non-S with AHRS, and a 3500 Slave Screen "S" Unit with no AHRS..I have your moving map, an SL30, and a GTX327 Transponder..Would like to add autopilot..request your recommendation for the unit that is most suited to my situation. Also, do I need an ARINC module?..I do have a 2.25 inch instrument hole available in panel..would like a list of what I need to get this done...any advice appreciated. Thanks!