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You will get many and varied answers to your question, as there are lots of newtonian owners on this forum. You need to think about what you want from your eyepice collection. For example: for your planetary viewing, do you require a wide field, or are you more interested in contrasty views? For your DSO viewwing, what focal lentghs are you interested in, and how much are you prepared to pay?. I'm afraid that at f4.7, widefield eyepieces which are crisp from the centre to the edge of field don't come cheap.
I have just taken delivery of a 5mm and 7mm Burgess Optics/TMB Planetary eyepieces. AT f5, they are widefield, contrasty and crisp to eof. Frontier Optics have a 3 for 2 deal atm. IMHO, they represent great value in higher powered eyepieces, especially for my 'unguided' dob.
Cheers and good hunting
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