5lb 12oz w/o engine & Rx sounds heavy. I have two SuperStar 40's that weigh 5lb 12oz ready to fly dry. My HobbiStar 60 is 7lb 14oz RTF dry.

One of the SuperStar's has a 46AX and flys GREAT. But your plane with a 46AX and Rx would come in at 6lb 9.5oz dry and w/ a 55AX 6lb 12oz, a lb heaver than my 40 size trainer. I would at least look at 55AX 1st, but the 46AX would fly it just fine to.