My vote is for the Goldgerg Ultimate as I am currently in teh process of completing one. This is a fantastic design which will fly wonderfully on a .91 as long as you keep it around 8.5 pounds. Very easy to do. The kit itself basically falls together and is expertly designed. I also have thhe Goldberg Sukhoi - yet another gem with a OS 1.08 up front. Hope this helps.