I guess I'll just stick with the Nuforce NE700Xs for now - after I got used to them, I realize how much I was missing out with the XKDUNs. Like I was saying before, the strong bass and treble of the CK700s gave the illusion of them being higher fidelity than they actually were. The instrument separation, detail, and overall experience is way better with the Nuforces. I'm not so in love with them that it'll be a tragedy if they break, so I'm cool with running with them and drenching them in sweat.
I'm going to attempt to learn soldering in a couple weeks and hopefully by then I'll also have a nice fixed pair of Sennheiser CX880s that will make searching for a good-sounding budget IEM pointless. The Sennheisers actually sound very close to the XKDUNs, albeit with a much more refined polished sound.
It's still too bad that the XKDUNs were discontinued though. It's nice to have a beater pair of IEMs that I don't have to worry about wearing in the rain or anything like that. Oh well.