Unless you like the "cuteness" of the iPOD mini or that it's slightly smaller than the other players, then I'd advise against getting one. As KOW stated, the 4GB size is TERRIBLE considering the $250 price tag it still carries with it. Even if you don't have a huge list now, you'd have room for expanding your music collection with the larger model, plus... even with extra room - with the iPOD's ability to be an external HD... you have extra storage space as needed.
IMO, the $50 savings on the mini simply isn't worth it.