Well, here's what I did. Seeing as how some of the best portable amps rival the full desktop versions, I bought a P-51 Mustang from Ray Samuels Audio so I would have the option to bring it with me if I so chose.
Check out this thread: http://www.head-fi.org/t/214588/review-portable-amp-roundup-56-portable-amps-reviewed-and-compared-final-update-12-20-10-added-rsa-sr-71b
The owner of the thread thought the P-51 has the best synergy with the E8 (which he owns) of any portable amp he's heard.
NOW, having said that, I am purchasing the Burson HA-160D for my own Edition 8 for home use. It's a great value if you don't have a DAC. The DAC is more than decent, and the amp is an incredible value. Only a few amps better it, and they cost much more. It's a very good entry combo into truly high-end audio. Another E8 owner purchased the amp only and loved it so much that he shifted his goals and priorities of upcoming purchases from a new pair of high-end phones he was thinking about purchasing, to upgrading his DAC. The Burson for him really made the E8 sing, but it was revealing of his source/DAC - which is why the the HA-160D DAC/Amp combo is a fantastic deal.
Edited by SoundFreaq - 11/17/11 at 3:33pm