The FiiO e9 is going to become available quite soon and it's pretty much going to have the price/performance market cornered as far as headphone amps go. I'm unsure if it will be able to power a hungry headphone like the dt990 600ohm. Only time will tell.
The Bottlehead Crack OTL tube amp kit is available for a nudge over $200. It's meant for high impedance phones. Of course this route requires some soldering skills.
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