Aperture is everything for visual observing. A 200mm Dobsonian will show you more than a 90mm refractor costing three times as much. The physics don't lie.
For imaging, the mount matters more than the scope. A sharp refractor on a wobbly mount produces nothing. Spend the majority of your imaging budget on a solid equatorial mount.
Southern hemisphere observers have different priorities. The Magellanic Clouds, Omega Centauri, and Eta Carinae are circumpolar from southern latitudes — wide-field instruments reward you more than high-magnification planetary scopes.
Light pollution filters help, but dark skies help more. A filter can suppress sodium streetlights; it can't recover the faint outer arms of a galaxy swamped by sky glow. Prioritise getting to a dark site.