I'll +1 the get on a track and try it first.
If you do move past that, don't rule out the non-sport package cars though. The differences are:
- Suspension, that you might be replacing/upgrading--I know it's heavier sways, different springs, maybe differently valved shocks/struts.
- Sport button -- who cares
- Sport seats-- this is worthy of some consideration, but may still be installed without the sport package
- 17 inch wheels -- which you might be replacing with track wheels anyway, but be aware that 17" tires save me around $80/corner when it comes time to replace