hey guys was have some questions really fast. I want to get a new wheel suspension combo. right now im on factory sport wheels and suspension in an 03. I dont wanna hafta get a camber kit and all that but do want to lower a bit should i get g35 or 350z s tech or h tech? and should i go with 18" or 19" wheels....i still want a good ride so maybe 18" and can you install the new springs yourself or is that pretty difficult? thanks