3 on the front - one on the rear - new tubes evrytime for me - all flints and glass removed after every puncture - the punctures happen on the way home on the same track i use on the way inPs... all different punctures? What kind? Have you checked the tyre thoroughly and got out all the flints etc? Have you been patching or replacing the tubes?
As said before, Marathon Plus although they are heavy and slow and slippery in the icy stuff. A bugger to remove in an emergency but I've never had to which was the point of going this way. Ultimate peace of mind I suppose but never say never when it comes to the fairy!
Same as StuAff, D+ on the road bike and Supremes on the CX bike, incidents are few and far between.+ another one for the Durano +. My road bike tyre of choice.
What I run on my commuter (the Portland) is the Marathon Supreme- on 28mms, and those are much lighter than D+ in that size (folding vs non-folding for one thing). Not as tough- one visit so far- or as long-lasting though. Still recommended with those caveats.
Michelin Krylion Carbon... if you can get hold of them.
Conti 4 Seasons are liked by some but never get my vote. I had heaps of punctures with those.