Start on the driver mod NOW. It takes time. (unless you just got mAd sKiLz) You don't need this that and the other thing to come drive. All you need is a car that is in good mechanical condition. You don't need the best tires, suspension or the most power. Not to say they won't make you faster, but the driver mods takes time. You can't just bolt it on. Wanna borrow some books? I have a couple. I started with a stock turbo, fuel and suspension car, just get out and drive! Don't let modding the car get in the way of the true purpose of the car, DRIVING it. I read your post, you want the car to be good at it. You might as well be good at it too!
Start here, same price as a trip to rock falls.
http://www.myautoevents.com/pls/mae/...sevent_id=9450
Good brakes are a good idea.
Stay with the 16G if your going to auto X.
Tires- been covered, you know what to do. Get wide ones if you can, more tire helps a lot.
Suspension- Your pointed in the right direction already. Ksports/ Megan isn't the worlds best stuff, but still controls the weight a lot better than stock stuff.
Power steering- Look at the VFAQ and do the mod they suggest for the power steering. I tend to out run my pump and need to do it as well, it can make things difficult.