Ok here is the situation. My car wont start. I'm pretty sure it's not the battery, because the radio and headlights and everything electrical is working perfectly. I turn the key and all I hear is a clicking noise...the car isn't even turning over. I'm pretty sure its the starter/starter cylinoid. I eventually had to get my dad to push the car while it was in gear then pop the clutch. It got the engine started...but I need to make sure I know what I need to replace before I go get ripped off at a shop somewhere. Does anyone have any experience with this?

ANY sugestions or info is greatly appreciated!