I just picked up a Pure i-20 to connect my iPod to my amplifier and I'm wondering if there would be an appreciable difference in sound if I picked up an external D/A to run between the Pure and my amp. I really don't want to spend more than $500 on the D/A. The Pure has an onboard D/A that is supposed to be fairly decent, but I'm wondering if there would be an improvement if I got an external D/A.
My playback system would be iPod Touch 4g > Pure i-20 > D/A > Cambridge Audio Azur 840A > B&W CDM-1SE. Any assistance would be much appreciated.