jarambulo wrote:I'm fairly new to this whole tweakin' the car thing, but is it necessary to install new springs for any rims?
Necessary? No. Would it be nicer? Less gap between tire and fender lip will look nice, but you sacrifice ground clearance and the ride quality will change (for better or worse, that's subjective... some people like the ride stiff, some like it soft). Handling will be more responsive.
Back to your original question... what is necessary depends on what you want out of your car and what you use it for.