While iPods are the in thing after doing my research I steered away from it.
At the time (and still may be true) the sandisk sansa had an FM player the ipod did not, it was cheaper, and I wanted chip memory versus a hard drive for running. it also had an additions memory slot.
The real bonus was the rechargeable battery. The sandisk had a consumer replace rechargeable battery for like $8. While the ipod had to be send away for weeks and it was like $40?
This is old news but you way want see if ipod caught up. Also ipod has many more extras hands down that I didn't want. I needed a very good running MP3 player and the sandisk sansa was perfect for me.