Headphone to match with Cowon iAudio9 and HeadAmp Pico Slim

Hello,

i'm planning to purchase Cowon iAudio9 and HeadAmp Pico Slim but i can't decide myself which headphone to buy to better match it with this two item.

Some ideas i have are:

- Head Direct Re0;

- AKG 480 NC;

- Shure SE530;

- Grado SR225/325;

- Beyerdynamic DT 990;

- Westone 3;

- Klipsch X10;

- Ultrasone HFI 780;

- Etymotic ER4;

- Alessandro Music Series Two;

In your opinion which of these one (or others) better match with the stuff in want to purchase?

I mostly listen to instrumental rock (Joe Satriani, Steve Vai, Greg Howe, Andy Timmons, Giacomo Castellano) and instrumental acoustic (Tommy Emmanuel, Franco Morone, Leo Kottke).

Thanks in advance

Have a nice day