If you want old tec and simple then a DR400 180 is the best of the fix gear fix prop machine. You get IFR and full 4 seat cap at 135kn with 180 hp lyk up front. This is however going to have the same fuel burn as the Tecnam for less speed and less redundancy. If you want to change the game you need JetA1 or a Rotax.
Rod1