Since I know nothing about lowering our cars, I though I'd ask you guys. If I go out and get a set of H&R springs or Eibachs and put them on, is there anything else I need to buy/install? Thanks in advance.

 

An alignment for sure. Depending on how much you lower your car you may need Caster Camber plates (Generally for 2" drop). If you want perfect alignment you should get Steeda's lower ball joints, and bump steer kit. I've got mine lower 2" and I still haven't even had an alignment. It's still drivable but it tracks in the grooves slightly.

CC about 250
LBJ 130$
Bump steer 160$