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I have a 6" f/8 refractor and a 10" f/5 newt, so about the same focal length as you. My wide field eps are 28mm WO UWAN, 20mm, 13mm and 9mm Naglers. The 28mm gets used for the really big splashy objects (eta Carina, M42, NGC 3532 etc) and as a finder ep. Most viewing is with the 20mm and especially the 13mm. The 9mm gets a bit of use but often if I'm using that high a magnification it's on a small object and I switch to the 10mm ortho, which is slightly better on axis than the Nagler. My favourite planetary ep is my 7mm UO HD ortho. Very nice views if you can handle the short eye relief. I also have a 5mm ortho but generally find the seeing doesn't support its use and the eye relief is so short you wind up touching the eye lens with your eye. I've used Teleview barlows but decided against buying one; I just spent a bit longer getting the collection together.
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