Tires will make the biggest difference then your basic spring, shock and sway bar upgrades. A good alignment when your all done. It all depends how far you want to go with it.
I Guess I Should Ask, If Budget Is A Issue What Would Be The Parts To Invest In First. I Would Like To Have A Good Ride Quality And Also Be Able To Get Into Corners.
Whats the budget? That may determine a lot of things. Its hard to give more of an answer then what was given without knowing a lot more about the car and what you intend to spend on it. (then double that number because thats what usually happens)