Small amp for volume increase only

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I recently purchased a new sound card (HT Omega Claro Plus) and I am very impressed with its performance. However my headphones (Beyerdynamic DT880s) are monsters and require a lot of power to be driven. The volume seems just a bit too low for me even on maximum. Also I use the same headphones for my 360 with an audio input (red and white cords from 360) to headphone jack converter because my TV has no jack. I'm looking for a small amp to increase volume only, no need for quality increase (but avoid a decrease, of course). The FiiO E5 seems to be a good choice. I'd like some opinions as well as info on where to buy the suggested amps. Thanks in advance and I await your replies.

EDIT: A friend of mine suggested this amp -

http://www.amazon.com/Behringer-Ultr...0358721&sr=8-3

Any thoughts? Thanks in advance.

I recently purchased a new sound card and I am impressed with the quality, but not the volume. I have Beyerdynamic DT880s and at full volume it is just a bit too quiet for my tastes. I have no interest in spending money on an amp to increase sound quality, just volume. I decided that I was going to buy a FiiO E5 for the volume increase, but I have a question about its performance. If I use the E5 to amplify the sound from my sound card, will there be a noticeable dip in quality? Or will the FiiO keep quality the same while raising volume without a penalty? Any info is greatly appreciated, and thanks in advance.