suggestions for a headphone amplifier


I recently bought a pair of Senn 650s. Up till now I have listened through the headphone jack on my Jolida JD100 player. Well, that only gets you so far....now it's time to liven it up with an amplifier designed to make the most of whatever these 650s have to offer. I am ready to choose based on the groups suggestions, so show me what you've got!
roccodigiacomo
The new MF model is nice for the few minutes I tried it, but I'm not a headphone guy. As with eerything else, audition it first, or pay fair market value if you're buying used.
How big of a sonic improvement are the Sennheiser 650's over the 600's?
In what all ways, sonically, are the 650's superior?
Thanks.
The Senns seem to like a good tube amp based on what I've read. I would shoot for the ASL tube amp. Try that for a while. If you have more to spend, but some Walker SST, first, paint all of your connections, then listen. If you still require greater fidelity (or maybe you have a greater budget at the onset than what the ASL tube amp would cost) then buy something better.
I own a set of Sennheiser HD-650 and a HeadRoom MaxedOut Home. Truly a great combination. I tried the Musical Fidelity X-Can V-3, good with Grado´s sets. The HD-650 does need more power do drive them.

Regards,
I second the Antique Soundlabs MGhead. If you can spend more, then Headroom amps will better the sound.

Rob