What headphone amp to use with Sennheiser HD800?


I just bought the new Sennheiser HD800 headphones and I would like feedback from other HD800 owners. Which headphone amps have you used with the HD800's and which they selected and why? I live in a very remote area and I am about 300-400 miles away from the closest high end audio dealer. Your suggestions and comments would greatly be appreciated to help me in choosing a headphone amp for these incredible headphones.
svrtim
Woo Audio WA5-LE with Sophia Royal Princess 300B, EML 274B, and Sophia 6SN7 tubes. Highly recommended.
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I used a Creek and did not like it as well as the Musical Fidelity amps. Creek may be better for Grados.