Get an iPod Touch with 120 GB. That is what I use. Quite a lot can fit on it, and it is actually faster and more convenient for me to adjust the music downloaded on it as needed than find 3-4 particular CDs, take them with me to the car, store them, and then remember to bring them back into the house (without some of them falling on the ground, getting their cases smashed, and discs scratched).