I've got the Portapros and KSC75's. My Portapros are stock, but I've done a few mods to my KSC75's (Kramer mod, attempt at the quarter mod, and I sprayed them with black primer). After those mods, I think I like the KSC75's a tiny bit better over the Portapros, but I haven't listened to them long enough since modding to say for sure. They're not way better, but slightly more refined with a little bit less bass. For both stock, I like the Portapro a bit better. You could just get two pairs of KSC75's. Mod one, and leave the other stock.
Sorry, but those are the only two clip ons/portables I've heard. I've got the JVC HA-RX700's, but they're not very portable and wouldn't be good for running.
For those who care, spray painting the KSC75's didn't mess with the sound at all as far as I could tell.