Sorry, no recommendations or experience in that price range. But a suggestion: if you really want good audio quality and truly willing to shell $500+ (=o), then spend some money on a good portable amp as well. Your iPod Touch isn't a bad source, but at that level of expense you deserve the best SQ. The FiiO E7 should come out some random day in February (DAMN THESE COMPONENT SHORTAGES!).
If a portable amp isn't quite portable enough for you, then I suggest you lower your price range, because those upper-end IEMs are usually pretty high impedance. Your iPod may be able to drive them loud enough, but not well. I don't think any IEMs in that pay grade are intended for portable use, at least without an amp.