What headphone amp to buy-Sennheiser HD 600?

Well, thanks to the kindness and patience of my fellow A'gon-izers, the hook-up "problem" for the headphone amp I have is solved. The amp is a Ramsey SHA 1. The phones are Sennheiser HD 600. I had remembered that amp sounding great. Now I'm spoiled by the new speakers I have, and even though the signal path to the amp is thru the Dodson DAC, I still think it sounds........not so great. Decent I suppose, but harsh on the upper end, yet without the mitigating detail, and you know, just.....unsatisfactory.

OK, OK, so here's the question(s): What's a great, fairly cheap (like, at LEAST less than a grand) headphone amp? Sonically, I want EVERYTHING!!!! (Except soundstage, that has never happened for me with any headphones, ever, I'm pretty sure not even with the expensive Stax I heard a few years ago).
It MUST have: Tight, deep, fast, smooth, tonally correct, musical bass, shimmering, non-fatiguing, emminently smooth yet ultra detailed highs, great midbass punch with no boom or softness whatsoever, midrange that is totally natural, smooth, detailed, and lacking any hint whatsoever of grain or electronic amplification artifact in the upper registers. It should sound great on ALL program material, from classical to rock to bluegrass to new age to jazz, anything and everything.

Other than those relatively modest criteria, there are no other performance demands. :)))

So, fire away!
I've considered the MF X-Can tube buffer and may get one if I keep the HD 600's. Thanks for the info.
"With the price range most people here are playing with, I'm surprised on one has recommended anything from the Headroom line. I've heard nothing but good things about them, especially the upper level amps. My friend has one and says the crossfeed process/switch helps with the feel of headphone listening by making it seem more like listening to speakers instead of 2 distinct sound sources. Maybe the solution to imaging?"

I agree with the fact that the maxed out home will probably be one of the best amps you can get for the Senns, esp. the balanced version.

I disagree with the fact that it solves imaging problems with phones. It helps move it in front of you, but the K1000 headphones are the only ones that really make you feel like you have a large soundstage (still nothing like a life sized speaker setup).
"Tube buffer or headphone amp?"
I suppose it would have to be both. But I just bought the Stax setup and want to see how that sounds after it gets back from being fixed. I'm still not sure whether or not I'll keep the Sennheisers and the Ramsey SHA 1.
Quick update:
The Stax headset has returned from Yamasinc, and has been rebuilt to original Lambda Pro Signature status. They look beautiful. Price for newer model 404 would have been almost identical, but I opted for the restoration based on what Swampwalker had said about having heard both units, what they had sounded like before I broke them with the vacuum cleaner (yes indeed, quite an idiotic thing to have done, yes indeed....), and based on a professional review I found somewhere on the 404's that said that there was a peculiar artifact in the bass response that was absent in earlier versions. Two weeks to break in, then I'll have "NOS" Stax.

Main reason for posting: Yamasinc appears to have done just an excellent job, and that's worth knowing for other Stax owners who may be considering upgrades and/or maintenance with that company, which is the authorized U.S. distributor.