I've just started using the Mavic Ksyrium Elite disc UST with the Yksion Pro UST 25mm tyres.
They are an absolute breeze to seat, no special tools or special pumps needed. Can be removed and put back on rim very easily with bare hands.
Very limited mileage so far, but wheels feel responsive. Also managed to hit a hole in the road quite hard already and no issues from that.
Tyres feel good, fast and grippy (dry only so far), but too early to say how long they'll last and how resistant they are to punctures. They are made by Hutchinson and have pretty good reviews though). They only come in 25mm with the wheelset, 28mm can be bought separately.
I've used Stans Race sealant rather than the supplied Mavic one - but I'm yet to see this in action!!