Zane/Cec
Whilst I am an enormous fan of the Pentax XW's they do have issues for some people when used in a binoviewer. That being that you need a head the size of Texas, because of the minimum interpupillary distance they offer as a result of their size. Some people with a large head can use them, many can't. Just something to consider before you drop $1k on 2 eyepieces
Having used both the 14mm and 21mm Denkmeier eyepieces in both cyclops mode and binoviewer mode, I can tell you they are absolutely outstanding in every respect. They are about the same size as the Nagler T6's but offer 20mm of eye relief and a lot more comfort. They have a 65 deg AFOV and are tack sharp to EOF in an F5 newtonian. Superb eyepieces, the downside is they only come in 14mm and 21mm focal lengths, but that may suit your needs. They are superb in cyclops mode as well as in a binoviewer BTW. FWIW I own 5 Pentax XW's, a 31mm Nag a 17mm Nag 4 and a 12 Nag 4 and I rate the Denks at the same level.
http://deepskybinoviewer.com/index.c...TOKEN=82097397
You can order these in Australia from Daniel Beringer at Frontier Optics. I think they are between $350 and $400 each, possibly a bit cheaper due to the favourable exchange rate.
http://www.frontieroptics.com.au/
Cec,
In answer to your subsequent post the 21mm Denk is a clearly superior eyepiece to the 19mm Panoptic and probably costs less money. It is also a lot more comfortable to use.
Clear Skies
John Bambury