What is the best portable audio player for iPhone?

Well I like the digipower 3 in 1 iPod kit, it charges in a car, holds the ipod and is an fm transmitter. I’ve bought 2 of them I might buy a 3rd, I took one fir parts to make a portable ipod charger, and modified the other with an external antennae. With the internal antenna you get around half a kilometer, and an external antenna as much as 1.3 kilometers. It has great sound, and hold your iPod/ iPhone very still. It’s approx. $50 on the website, but only $30 at Canadian Tire but they were on sale for $12. Hope this helps!