cowon EM 1 & SoundMagic ES 18 are good for there price. The EM1 have some upper hands over ES18 in high notes & build quality but it also requires an amp to drive it to it's full potential(checkout tech2 review of Cowon EM1) For the most extend the source you have mentioned Canvas A115 will only produce average results (check out tech2 review of Canvas A115). The audio quality is highlighted as average even with the used of good IEM's. I suggest you buy ES18 n use it with a PMP if you own one to get the best results.