headphone amp question


I have an Antique Sound Labs MG Head OTL Mark II headphone amp and Sennheiser 580 headphones in my main system. It seems that the volume in my library (another room) is too much for my wife so I am looking to add another headphone amplifier to that room. Should I buy another ASL headphone amp or upgrade to the next level? I plan on keeping the Senns. I like them alot. What other candidates should I consider? I know there is another headphone only site, but I have grown accustomed and comfortable with the advice from Audiogon. Thanks for your guidance. And, by the way, thanks for years of advice and entertainment from this website.
tgrisham
I realized after the fact that my new Kavent preamp has no headphone output...oops...so I bought a Bravo V2 because it's looks so cool (hasn't arrived yet so I have no idea what it sounds like). It's so inexpensive I figured how could I miss?...but am curious if anybody out there uses one. The Kavent has an extra set of line outs to drive it.
Mcondon, great insight and experience. I am getting excited about this new venture. Whereas initially I was bummed out. Lemons and lemonade.....
I have the Woo WA6SE and it's a great amp. It might be overkill for the OP's Senn which is why I recommended the Little Dot MKII. I'll add the MKIII. Which is the one I had and is really nice for the money, is a nice upgrade to the MKII and does nice with tube rolling.
Oops. I misread my own post. I did recommend the Little Dot MKIII after all. Please excuse my silliness. The MKIII is still a very valid and excellent amp.
Also...the BravoV2 is VERY inexpensive...about 60 bucks shipped from our Chinese brothers.