my take on the choices above are that pectel ( i have used this) have 'been there - done that' with there ecu's the T6 being the upper middle of the range - and out classes the likes of autronic for functions. the thing that would put me off using autronic ( cost not coming into this equation ) is the likes of the 'add ons' that mark talks about. these are obviously new to autronic , and although im sure they would have been tested before being introduced , they are still new add-ons and subsequently may be subject to revision as the product goes out to mass use , the motec - i have no experiance of , but the track record is certainly there.
IF i ever changed ecu, it would be T6 without a doubt - its totally the complete ecu all in one - no extra's no add-ons , no compromise-and proven in motorsport.
i have used DTA P8 - and this would be at the bottom of my list im afraid for usability