>I was just wondering which one most people prefer coil overs
>or springs. I was also wondering which brands everyone
>seems to prefer over the others.

I have skunk2 coilovers and tokico blues and love them. They are easy to adjust and look great. Plus now my car takes corners like a champ!

>and do you have to replace the struts with just the coil overs or >with the springs also?

Really you don't have to replace the struts with either, but I would highly recommend it with both!