Probably opening a can or worms here, but have been giving thought to jumping up from my Shure 425 earphones with Eston Linum Music cable to something up on soundstage and quality. I appreciate it's all subjective on quality and sound but there is a bewildering selection of options available...

I have been on a bit of splurge recently and have attached to my Vita/Ruark R4i an Arcan AirDAC to stream lossless music from my server via upnp, a rega ears headphone amp and a pair of Senheissier 380Pro headphones.   It all works very well and I am happy with the quality.  More than happy...