Nealh, it will be interesting to find out how you get on with the tyre choice.
I can't currently ever see me switching away from Hutchinson tyres, and the trick is to buy them when discounted. Not an easy thing to do, and I'm always looking.
What I hate is riding on tarmac with them, as you can just watch the pound signs disappearing along with the tread. Dedicated off road tyres are also unnecessarily noisy, drag, and are un pleasant to use on the road. The Toros are reasonably good in that respect, but not the DZO's.
Tyre choice is always a tough one, but I really can't grasp why people often seemingly choose a very aggressive down hill tyre, then spend 99% of the time just riding on roads and hard packed tracks.
It was way too hot this afternoon to even think about heading off to the South Downs for a ride, so instead it was decided to just do a short local ride.