OK, having given this a bit more thought, I've come up with an alternate plan...
The Televue site has a section specifically for 6" - 10" dobsonians with f/l 1200mm, and one of the mid-range eyepieces they recommend is the 13mm Nagler Type 6. I think I'll go for one of these - my thinking is this will also give me a 6.5mm option when used with the 2x telextender. It's also an eyepiece that will be more affordable for me in the medium term.
I'll eventually get a premium low power, wide field eyepiece, but there seems to be a few different ways to go here, and I think I'll take my time and try to have a look through a few before I decide, especially considering the cost involved.
Thanks Patrick, Steffen and Mark for your input, it's much appreciated!
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