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Yeah 8-10” is a bit of a sweet spot between portability and practicality.
If you’re visual only, avoid equatorial mounts...they’re not exactly grab and go (even though the AVX is lightweight).
When all is said and done, what details you see on the planets is mostly dependent on the seeing...if it’s poor, you will just get a blurry blob when you increase the magnification...but when it’s good, you’ll be rewarded.
Regarding an SCT...I frequently use a 8” Celestron here in Brisbane and dew isn’t a problem most of the time, but I’d imagine the humidity is worse in Cairns. Just prepare youself with a heated dew strap if you go that way.
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