Just bought a HD800 to replace my T1. This is probably a really stupid noob question, but will they drive (moderately to decently) ok with a Nuforce HDP or a CEntrance DacPort (I wanted a portable USB amp with a 1/4" output)? These are the only AMP/DAC's I have (unless you count cheap Fiios), and I can't really afford a $1000 WooAudio Amp. I've heard the HD800's are notoriously hard to drive/amp-picky, but I'm just not sure to what extent. Thanks!