For $30? The Fiio E6 is the best bet you've got. It's not a bad choice, really. It offers roughly double the voltage of most portable sources and will be enough for the SRH-750DJs.
32ohm and 106dB? Amping won't improve much, but if your portable playing doesn't sound as good as your computer headphone jack, then you may want a E5 or E6. A cMoy if you want more power.
Not significantly. Even with an amp, even a very powerful amp, I wouldn't expect too much gains on this headphone. kingpage is right, the power consumption of the headphone is pretty low.
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