Rep Power: 315

i have a 2003 lx coupe and i am looking to add some better speakers but im not sure whether to get justspeakers or components. i see in components that there are tweeters and all that stuff butin my car there aren't any spaces for them so im guessing maybe they have to be drilled in. so i was curious whether i only get speakers or do i get components and get them drilled in. i thought maybe in the ex they have the tweeters and lx just get speakers. so if i wanna upgrade the speakers, do i get components or speakers? i was looking at jl's probably to match my sub and amp. any other really good speakers/components. thanx. if the front and back are different u can tell me too like if the front get components and the back get speakers.