[GeorgeGoodman]

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Some high voltage Cmoy. look on Ebay for 9 or 18 volts.

This look fine?
 
http://cgi.ebay.ca/Biosciencegeek-Headphone-Amplifier-cMOY-Premium-Amp-/140485973902?pt=LH_DefaultDomain_0&hash=item20b59dd78e
 
Looks credible, has a review here on HF, and decent ratings (after some search). Apparently these will also drive the 600 ohm ones pretty well? At least, would it drive the 600 or 32 better than the FiiO E7? (If it'll drive the 32 ohm, I'm guessing it'll roughly adequately drive the 250?)
 
I think my choices are down to either 990/600 or 880/32 or 250, depending on what can be driven by the E7/cMoy.

I would go for the Cmoy. It has a few good reviews driving 600 ohm phones, and it is only around 50 bucks. You could upgrade to the E9 later. If you are looking for good sound, the higher ohmages are smoother and more neutral. The DT880 is supposed to be neutral, but is a little treble heavy from what I have read. You really cannot go wrong with the DT990 600, as i have read many good reviews for it.