Difficult to know where to start, really! I wonder how rapidly ppruners could produce a list of aircraft 'designed with the sole purpose of being a training aircraft' that would have in excess of one hundred types on it?
I think you will find that ever other a/c that is regularly used for flight training (e.g. C172, C150, Grob Tutor, PA-28......etc.....) were all designed as touring a/c or for other purposes where as the 152 was simply designed to train.
Seriously thou guys, your telling someone who is asking our advice to spend more money on a more difficult a/c to fly. If you felt sick then that is only natural, some people get that feeling due to the spacial disorientation & the different sensations in the a/c. Next time you fly take a bottle of water with you & a sick bag just in case but most importantly focus on a fixed point far away in the distance, open the fresh air vents & tell your instructor. The best thing he can do is give you control & let you fly for a bit, that will stop the feeling pretty quickly!!
Jamie