1) How much should I be looking to spend on used 20" Vogue CV-7's?

2) Will I have any fitment issues?

3) Which tires?

Quietness, good handling and safe at high speeds is a must for me. Also not feeling like I'm going to break the car every time I hit a bump would be nice also in taking tire selection into consideration. For some reason, I think it's safer going over 100mph with run-flats rather than regular tires that can have a blow-out. Is this true?

I'm still wondering what the noise difference would be coming from stock wheels with run-flats to 20" CV-7's? Any input on this matter also would be great. Thanks.