Or you could go with Boyd's alloy 25mm tubies:
Lighter (1409g) than the Williams/Neuvation wheel sets and as for customer service, you deal directly with Boyd or his wife in South Carolina. $100 more, but Boyd uses top notch parts, builds his wheels and stands behind every one of them. He actually talked me out of a particular wheel set because it didn't fit my needs. When was the last time someone tried NOT to sell you something?
Sorry to throw a wrench into your wheel choices :)
From what I understand, Boyd makes good stuff. There are people riding them all over the place down here.
I rode both the Neuvation wheels and the Williams wheels last year, and will be on the Williams this year.
I felt like the Neuvations were noticeably lighter (my Williams are probably two years old, so a different build), but I feel like the Williams are stiffer and sturdier. The thin spoke on the Neuvation wheels made me a little bit nervous, and I felt like I was winding up the hub before the wheel would start turning. The Neuvations also have a wider braking surface than most other wheels. So swapping sets takes a few seconds.
Otherwise, both are very good wheels. Never had any catastrophic failure with either, and I never felt like they were a hindrance.
The hubs alone are worth the asking price - heck a new 240 rear hub is almost the asking price. If the setups in good condition I say do it.