First off, neither of the amps posted were straight headphone amps. Both of them can drive speakers. Whether or not they can drive HIS speakers is a different story.
@clowkoy: No. The asgard is not going to power large speakers any time soon.
Who ever recommended the lepai is also a bit off. I bought the lepai for a small weekend DIY project, and it had some really bad distortion problems when you turned the volume up. Long story short, it is a piece of junk.
The bravo amp should be burned and left in a shallow grave. It is essentially a crappy SS amp with a glowing piece of glass on it.
And finally, troll dragon is right. Chinese amps suck. They are often times thin sounding, and you would be better off buying a decent solid state receiver.
@OP: At your price range you would be better off hunting tube equipment on ebay. A pretty decent tube amp would be a jolida FX10, a sansui 1000a (especially if you take the time to clean it and restore it a bit), maybe something by Knight or dynaco.
In any case, you can always get a tube power amp, and then get/make a speaker amp to headphone amp adapter.
So basically, the two things I want to do with an amp are inconsistent with one another, and all I can afford is crap anyway. I wanted to hear what all the fuss was about with tube amplification. I've never owned a tube amp, and always have been something of a skeptic, especially at the prices they commanded the last time I even looked into it (20-30 years ago.) To someone who's been "away" so long, discovering the existence of so many reasonably-priced tube amps was revelatory, and seemed to signal an opportunity. I don't expect a miracle for the amount of money I am willing and able to spend, but crap that doesn't even do what I need and and doesn't do it for long is no bargain at any price. It was the reviews on Head-fi that prompted me to investigate what was out there, and rekindled my desire to check out a tube solution.
I quit paying attention to audio for so many years for two reasons: My point of diminishing returns with audio gear has always come at a pretty low price point (coincidentally just above my maximum budget, and apparently it's still right about there), and; too many audiophiles had their heads too far up their own asses for me to keep a straight face in any discussion of sound. Neither the totally subjective approach of The Absolute Sound or the clinical "If it can't be measured it isn't real" approach of Stereo Review (sorry Julian, wherever you are) seemed complete to me, and I see that both approaches are still alive and well. Thank you all for the attempt to help, but I've gone from being excited by the myriad of possibilities out there to being certain I can't do anything that makes sense with the amount of $ I have available. More's the pity, but so be it, I'm gonna go listen to some music on my ****ty stereo.