My suggestion:
Buy a rulebook and do as many events as possible. Take an Evolution school, talk with experienced drivers, ride along, get as much seat time as possible for the first season or two then worry about the car. You could be driving a nationally competitive car or a slow ass tank your 1st season and it will not matter until you work on the most important aspect of going fast: the driver. As for Hondas in SM, well a B series hatch down on the minimum weight limit with 800+ lb springs and Moton triple adjustables and an amazing driver could concievably win it, but you still have to deal with the E36 M3 if you want to win, which in all honesty, is just a outright faster car around a course than any FF car is. *shrug* just go out there and have fun and don't get all caught up in the car. Drive the car in whatever class it fits into and enjoy it.
And FWIW, don't think because you think of yourself as a "good" driver that you will be fast at autocross. Prepare for disapointment if you think you are going to FTD on your first day out. Not to be rude or anything, just a reality check.