I would highly recomend the Sig SE. I have one and am running a .46 AX in it and she roasts along pretty quick. My brother has one witha .55 AX in his and he loves that combo also. Both our SSE's knife edge pretty good. Ther is zero control surface flutter with ours at high speeds. My brothers Twist and my Phoenix Funstar and Funtana 40 all have flutter at high speeds. The SSE can be docile or a real preformer... your choice. Beef up the landing block area and install a differant tailwheel bracket and you will have one tough, durable, multipurpose flier that can take you to the next level and give you the thrills that you are looking for.