You could choose from a VERY wide assortmentof aircraft.
If you are after learning PRECISION aerobatics, such as AMA Pattern or IMAC... you want to head for a Four-Star or a Tiger (yes... they are going to keep comming up... for good reason.

) or there are some new "Pattern" style ARF's in .40 size. The Tower Kaos is not a bad choice. (1970's Pattern aerobatic design... still a good airplane..[8D]) And there's a lot of other good candidates....
If you are headed for 3D... you will want a Dazzler, Somethin' Extra or one of the above mentioned profile designs or a "Magic"... or any of a WHOLE BUNCH of models...
there's several "schools" of aerobatics... Pattern, IMAC, 3D/Fun-Fly, Classic Pattern (which is quite different from the current AMA rulebook... its an appx 1979 era version, for which the Kaos, Sig's King Kobra and a few other similar models are ideal.) Then there's simply learning "boring holes in the sky" style... (which I think we all go through for a while at some point...)