Tony keep what you have and don't develop a case of Eyepiece Envy.
On an f/10 scope pretty much any good eyepiece will work fine, you aren't going to get anything significantly better by splurging on the latest super-ultra-maxi-wide from televue or Explore Scientific.
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Can you give me an idea if my ones are considered to be the ‘classic’ good ones or not?
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Forget it. Whether they're "classic" is irrelevant - they're not collectible and don't appreciate in value. Astro gear - eyepieces included - depreciates faster than cars.
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I want to get good widefields at low and high magnifications, and I’d like to get good planet details.
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No eyepiece does both.
Basically, the wider the field of view, the more glass elements internally and air-glass surfaces. This degrades transmission and contrast, contributes to light scatter, internal "ghosts", and on-axis performance is generally compromised to get good performance at extreme off-axis angles.
The best planetary views are generally had with relatively simple eyepieces with few elements - monocentrics, RKE, Plossl, orthoscopic etc. Buth these have a small field of view.
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I like the sound of the Ethos 21mm, 100 AFOV, but I live in the northern suburbs of Perth, Western Australia – there is some light pollution, and I am worried that a 100 degree field might just accentuate any skyglow and give a disappointing result.
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you are right about that, actually. The usual result i your night vision is degraded and you don't see faint things so well as you might hope.
In suburbia there is a lot to be said for eyepieces with a modest field of view with a big black region outside the field stop - this maximises your night vision.
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Would a Delos be a better bet?
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Not noticeably better than what you have.
Your exit pupil might reach 5mm if you are lucky (I'm 57 and mine is 4mm).
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can a Meade 2080 8inch SCT give the full view in a 2 inch
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No it cannot. The central hole in the backplate is considerably smaller than the inside barrel diameter of the big 2" eyepieces.
While you can try one it will vignette for sure.
FWIW I have a Skywatcher 7" 180mm f15 maksutov, this is the smallest cataleptic that comes with a 2" back, and it can fill the fields of the Vixen 42mm LVW and LV50mm - which are my preferred low power eyepieces.
On a Meade or Celstron f/10 SCT the smallest that can fill these eyepieces are the 10" (Meade) or the 9.25" (Celestron).