You may want to do complete check of you car to make sure everything else is sound too (maybe you already have). Make sure the wheelbearings are all still good and check for the common wear issues in the Focus (clutch master cylinder comes to mind).
A complete brake fluid flush with new rotors and pads is a good plan, and you have some good choices there. Your brakes will get a workout on the track!
Regarding the tire/suspension delima, if you're still rolling on the original shocks, replacement's a good idea. If you're looking to save money I'd put in some new SVT shocks and struts and keep the SVT springs. Next, burn through your current tires at your first event, then slap on some *specs for your next one, and be completely amazed :D Once next winter rolls around, pick up some used focus 16" wheels with all season tires for your second set of wheels.
Now with this near stock setup, you can work on driving fast, with the right lines at the track. Once you get to the point where you can be fast at the very limit in a stock SVT, you can take full advantage of any future upgrades you do. At the track ask questions and keep an open mind about your driving, good luck!
Parking Lot Hero
2008 WRX daily driver
2003 ZX3 23D Autox Car 42 FSP
"Hella Functional - Raced, Not Hard Parked"