The XTR wheels fitted with XTR rotors make a really strange screaming noise. theres some sort of resonance going there.
if you get the XTR (which are fantabulous) use the XT centre lock rotors.
If you decide to use another brake system which uses 160mm rotors you can still use the XTR wheelset. IME the centre lock system is fantastic because it's easy to remove the disks when travelling to avoid damaging them.
You can't go wrong with Either wheelset.
But remember, the XTR wheels can only be used with a brake system that uses a 160 or 203mm disc rotor