this is a serious problem i have. i like the fact that the tsx is a 4 door. as a wanna be parent, i like the fact that a car seat would be easier to fit into the 4 door. the tsx has the wonderful honda k24 motor which is a quite powerful 2.4 L 4 cylinder engine with the i- v-tech system which alows you to get awesome gas mileage during normal driving circumstances with extreme performance under high rpm driving. on the flip side however is the wonderful rsx-s. this car has the amazing k20. it is a smaller engine but in type-s trim it is actually tuned up to make more power than the larger 2.4 liter engine. this car is retarded fast and very enjoyable to drive. it also has the same i-v-tech system employed by the 2.4 liter but because of performance tune gets slightly less fuel mileage. so basically which would you prefer, the all out performance of the rsx-s or the useability of the 4 doors at a slight loss in perfomance. whichever way you go however, i feel that it is a great decision either way.