Since the above was written Heine have updated the Delta 20 to have
both polarised and non polarised light. See the Heine website
There is also now a DL4 dermatoscope from 3Gen. Magnetic rings allow easy coupling of small digital cameras to the dermatoscope to record images. See Australian DL3 distributer
You can also get attachments for smartphones from both Heine and 3Gen but I still prefer a dedicated setup.