Dianma (from what I've heard) isn't that great, Gans III v2 (57mm, right?) is really fast and has awesome corner cutting, but it makes it feel pretty unstable. It was my main for a little while, but it just felt too unstable and flexy (yes, the core actually flexes) that I decided to give it up. Weilong is a great choice, and same with the aolong, but if you are going to get the aolong, get the v2, and make sure it is the new batch of plastic, the old ones had problems. The v1 also had problems.