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Hi Jas, I don't know enough about them yet to advise on their use on Newts. I think MattT can answer that better.
As for eyepieces I would suggest trying it with some cheapies until you're sure you want to use them regularly. One thing to remember is that the bulkier eyepieces do not work for everyone, it is best to try them before buying. The determining factor is your interpupillary distance and also you need room for your nose, especially with short eye relief eyepieces.
The eyepiece focal length needed also depends on the scope and whether you need a Glass Path Compensator in the optical train. I think with newts you will need to use a GPC.
I am using mine at "native" that is I have removed a section of my refractor OTA 105mm in lengths which corresponds to the length of the lightpath of the Denkmeier binos. This means that a 12mm performs in the binos same as it would without the binos.
A GPC is a form of 'barlow' in that it multiplied the power of the eyepiece. You would use longer focal length eyepieces with a GPC than without. The difference being the GPC factor.
I strongly suggest trying the cheaper ones like the WO or similar before splurging out for the Denkmeiers, Baader Mk Vs etc. Perhaps try to attend a viewing evening and try someone else's first (bit difficult around Lismore perhaps, although I know around Nimbin they have parties where everyone sees stars)
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