The UM series is tuned for professional stage monitoring, the W series is for consumers. That doesn't make the UMs bad, it makes them functional at perhaps a decreased sense of musicality. But even that's subjective.
Has OP considered going in a cheaper direction for the hell of it? I mean, it's an unfortunate thing to lose earphones you love, but it's an opportunity to give some other 'phones a shot. There is some seriously impressive mid-range stuff at the moment which many people feel is edging out on the old high-end favourites. The Zero Audio Tenore seems to be absolutely blowing people away and it's a fraction of your budget. If you still want hi-fi, I think some of the new BA Audio Technicas come in under your budget and they come with the removable cables we love.
The JVC FX850 is in your budget, has removable cables and is also currently being raved about, but I must say the fit looks a bit scary.
Other budget options that are doing the rounds at the moment are the Ostry KC06(A)s and Havi B3 Pro ver 1s.
If you want to get in on what seems like a great a deal, Lunashops is offering refurb Shure SE535s for $200.
Then we've got Dunu with its hybrid models that people are loving, but I know I personally couldn't spend over $300 on a design without removable cables. Apparently they sound great, though.
No, seriously. There are some fantastic things happening in portable budget audio right now and I think you'd be missing out by just going with what you know.