I need a portable amp that will be enough to power hd800. I have the money to buy hdvd800, but i need to be able to take it with me when i am traveling. I am not listening at hd800 in noise, or anything, but i am traveling a lot, and i am taking my things with me, mostly in a Backpack like asus ROG backpack. so i need an amp, that, if it cannot be portable, i mean usable as portable, to be small enough to carry around. Some ideeas my me were fiio e12... they seem small enough to be packed in a pocket of a backpack. worthy to mention, i think is that i can get marley m2tech at 25% discount, due to a sell, but i am not jumping on it because it is a little too big for my needs and a little too heavy... In the same backpack i am puting the amp i will have my laptop, 17", i will have a rat9 mouse, a keyboard, my fiio x5, and an external hdd... so i want something not too big.