Thanks Wavelandscott, I got the impression that Denks were good eyepieces, but I was initially hesitant as they are often sold as a pair and designed mainly for Binoviewing. John of Ausastronomer fame put me straight on them. I know that I can get both eyepieces from Frontier Optics, so may be able to wangle something with Daniel.
Whilst I am ready to order a SkyWatcher/Saxon 10" dob the skies have been rubbish lately in Perth, so I may get the eyepieces first. The problem is someone always sells a tempting eyepiece here on IIS and I've bought 3 already, so maybe I had better not look on the For Sale section until I've got the scope.