I did some extensive reading on zknives site - and as much as I am angry and upset with him, you, knife/blade forums and every other qualified person that has given me guidance on the subject -Worth it? Not unless you really love the looks. It's very nice and all, but way too expensive. How about an Ikkanshi Tadatsuna western? Or, a Kikuichi TKC? You won't get that dramatic swept back, but still... At any rate, the Tadatsuna's back is very nicely crowned, and it's easy enough to round off any sharp edges on the back which weren't relieved at the factory of another maker.
I think you get about the same performance from a Masamoto VG as from the Nenox, with a better handling profile -- but not the same craftsmanship. Of course the Masamoto is less than half the price, but value is where you find it.
Heck, I think you can still buy a Haslinger for less than a Nenox S-1. But don't let me talk you out of it. If you're really in love with the Nenox and can afford it, wotthehell wotthehell -- live.
When I decided to add a non-Sabatier to my block, my choice was to leave the land of western handles and buy a Konosuke HD. Considering what you seem to value about the UX-10, you may be better off choosing a similar path. FWIW, were I to buy a stainless, high-end, western handled chef's it would probably be the Tadatsuna.