After having the denon d5000 for nearly 2 years and buying cheaper mid fi (such as the AKG K702) cans along the way I have decided I like the denons sound the best. However it's been quiet a while so an upgrade is in order. I'm currently running the denons through the fiio e7+e9 combo and that's good enough in terms of loudness. I was looking at the Audeze LCD 2, Hifiman HE 500, or even just getting upgrades for my denons (new cables, pads, cups). My budget is definetly UNDER 2000, way under if possible. I want the best bang for the buck. Thanks in advance!