Are there any BiS sets that use the gordian belt?

I was totally going to get eso belt after a2 last, and then the belt dropped >.<

As a secondary question, what Det would be too low? I'm having a hard time coming up with a set to stay around 400 det, but most sets I'm coming up with range from 276-350ish. Even if crit is that much better, I don't want to see 276 Det.. Ever.. Lol