Advice on best controller please

Hi All
I am about to embark on a VTOL project, I am going to use the AAI RQ-7 Shadow airframe which will be powered by a 21cc gas engine, my plan is to add a boom to each wings with 4 motors providing the lift the transition will be by reducing lift while increasing forward thrust, I intend to increase flying control distance and video distance by using the Dragon Link V3 long range system and the FPV1013 V2 video system, I am looking for advice from the many experienced people here as to which flight controller best suits my needs, or advice on alternative kit that would work better, I am very inexperienced when it comes to the electronic workings and the many abbreviations used when you guys reply, so if anyone is able to advise me could you use the special needs version of your reply.
Thanks for looking.