Depends on how extreme you want to go. There are alot of things you can do, but some have offsetting sacrifices that you have to make. A wider tire always helps, but weight transfer is a huge contributing factor. For that you'd want different springs that allow the front to rise and the rear end to squat. Also aftermarket upper and lower control arms will aid as well. Subframe connectors will also tie the unibody together and keep the car from using it's power to twist the car. Check Steeda, Wolfe Race Craft or Maximum Motorsports - just to name a few.
But decide whether you want a 1320 burner or a corner carver - you can have both, but it's easier (and cheaper) to dedicate your car to one or the other and be successful. (for example, you could cheaply and easily install a couple of junkyard Fox 4 cyl springs up front and remove the front sway bar and this alone would help the weight transfer, but wouldn't do much for cornering) I'm not an expert by any stretch, but this will hopefully get the discussion going...
Or you could just throw a couple fat guys in the trunk! LOL!
Best of Luck!