Rockin the Road

Alright, well now that i got my car rollin at some decent speeds, i think it's time for some decent tunes, SO....I got a 95 bird w/ stock stereo for now. I don't want to put in any subs or an amp, I just want awesome speakers and a nice head unit. Any suggestions?? How many speakers will I need to replace? And finally, what will the dent in my pocket be???