Spec me a portable headphone amp

Best options I can think of would be the Fiio BTR5 or the Earstudio ES100, both around £100. Next step up would be a Fiio Q5 at £300 new, although you might be able to find one used within your budget.

All of these have a balanced output, so it's worth picking up a balanced cable (like this) to benefit from the extra output power.
 
How portable? Just picked up a btr3k for my Aonic 4 and I really rate it. Plenty of power with a balanced cable and sounds great with Ldac. It's light enough to be wearable on a shirt, which is a definite plus when I start commuting again.

The main downside is it doesn't have enough muscle to drive my HD 650, but that's not really something I'd use it for anyway.
 
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