What kind of a speaker system should I get for my car?

I'm not really good with all the speaker lingo and stuff, but i know i want to get some subs and an amp that will sound good in my Jeep Grand cherokee. Im looking for a quality system that will sound good, but i dont have a lot of money to put towards it....maybe $150 to $200 would be nice. So what recomendations can you give to get the most bang for my buck?? Thanks for all your help!