Just ordered a pair of ATH-ES10. While waiting for them to arrive thought I would pick out a good matching portable amp/dac, my iphone will be acting as the source. Rounded up some candidates, but choosing is a nightmare (couldn't find a comparison review). The options are TTVJ slim, RSA Predator, iBasso D12, Leckerton Audio UHA-6S.
Please feed me some thoughts and experience to make a good, fact based judgement.