So I purchased some headphones as a start up, AKG K518 LE's(as a gift), Ultrasone DJ1 Pro's, and Audio Technica ATH WS70's. I loved the AKG's, liked the AT, and sadly have no clue on the Ultrasone. You see, I plugged them in when they arrived and got nothing.. literally. Absolute silence...

  I have around $200 dollars. Most all my music is purchased in itunes(256kbps). Would you recommend I get just headphones for around 200 or ~$100 headphones and a amp/DAC or amp like; FiiO E7, FiiO E11, FiiO E5? I would like them closed back and over-ears as I plan to connect them to a Turtle...