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I use the Orion TOAG (10mm wide) which if you are using a coma corrector with only 55mm backfocus is almost mandatory. That or the TS Optics thin OAG.
h0oughy recommends the ONAG but I don't think they work with Newts, not enough backfocus, they're too big.
The Orion TOAG is a pain to get right and took me nearly 4 hours until I was satisfied. The prism is very small so the FOV is not very big. They also suffer from flex, so I have the Lodestar tied down with a big rubber band to stop it from swaying.
Cheers
Bill
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