you said sporty 2 seater? then the 2g rx7 is out of that class sopme models do have back seats. and the ones without them have extra weight. if you want a 2 seater stay away from the delsol its slow thats why they call them "delslows" as for a miata get a BP-T from japan (miata turbo motor) and stick with that since you already like the miata and if your talking around the price of a miata,rx7 gen 2, and a delsol you probably cant afford a s2000 so the turbo miata is your best choice.