The graupners are an absolute must. I cannot imagine flying without them now that I have them. Right now I am using 10x5's but plan to move on to 12's once I get a proper camera gimbal and larger battery capacity (weight). Of course I will have to go with arm extensions to be able to fit the larger props.
http://aerialmediapros.com/store/product_info.php?cPath=25_36&products_id=157
In regards to gains I was able to get them dialed. I started out thinking that they would need to be super low with these monster motors. Oddly enough this wasn't the case. Tonight when I get home I will hook her up to the computer and see what I have them all set at, then post the values here. Flights with the avrotos are better than I had hoped. The avrotos are so close to perfect balance that all I had to do is statically balance the blades, mount them on the motors, then dynamically balance the blades on the motors. I didn't need to balance the motors themselves at all. These motors and blades are damn near perfectly balanced now which means
zero footage "jello". They are rated for a max of 350 watts per which equates to 2.8 HP for all 6 motors! They run super cool. After a 10 minute flight they are only slightly warm. I haven't placed a temp gage on them but I imagine temps are somewhere around 110 to 120 F.
With the combo of these motors, graupners, and Naza GPS this bird is amazing to fly. Heck it almost flys itself!