I used a muvo slim, shaped exactly like a credit carb but .27" thick. USB 2 compatible. FM tuner and mic built in. 15-17 hours of bettery life recharged through the USB but also replaceable (removeable). Has equalizer, shuffle, all that. Can also make .wma's from the radio, it records them for you and saves em. Only down side is that it doesnt have a big screen but the titles will come out pretty large, atleast enough for me to see while driving. 128, 256, 512, and 1 gb capacities. Cost is $79.88 for 256mb, $119.88 for 512mb on amazon.com