I have a 1998 Sentra SE. I need new struts all the way around. I'm about 15 miles away from 100,000 miles and I've had the car since it was brand new. The car is floating around when I hit bumps. My question is, what kind should I buy? I don't want to lower the car or anything like that, just return it to it's factory ride. I can get Nissan Struts for about $50 a piece. Should I opt for aftermarket struts? Also, do I have to replace the springs? Thanks in advance.