Well, now that i have aquired my lisense

, as of less than 24 hrs ago, i now need to start thinking about what I am going to do with my ride.
My car right now has all stock audio equipment, which doesnt include a cd player.
My problem

:
I dont know weather to chose between:
-A head unit that can play MP3 cds and a portable mp3 cd player
OR
- A 20gb MP3 player [i.e. an IPod or Iriver H320] and a wireless/wired way to get my music to my car stereo.
Money is not rollin in for this project so I am on a limited budget.

Please give ur opinions / suggestions , bc i may ask for part of it for Christmas.