Audio Amplifier - Best Kind? Suggestions?

[x 77 x]

Looking for a audio amp with volume control to use in a portable console. XBox 360 with internal speakers and stereo headphone jack.

Does anyone have any recommendations?

Everyone uses them but I haven't seen a style/brand/website that anyone says works best.

Thanks in advance for any suggestions!

[Kyo]

Are there really that many people that use one? I haven't seen any portables with one...

anyway,
http://www.google.com/search?client=ope ... 8&oe=utf-8