I....
Well....
Ummmm...
Get one of everything?
Don't "upgrade" for the sake of upgrading. As Wire and Hum said learn the car and then figure out what you want. You are going to get more confusing answers here than if you just learn what there is and what YOU want to do. Hell, half these guys will tell you to take the extra and buy a Miata as a second car!
Read up and make up your own mind:
http://www.ft86club.com/forums/showthread.php?t=96158