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Hi Gino,
As a Sydneysider who has been involved in and off for 40 years...
From suburbia using a small scope you can usefully see the sun, moon, planets - even Neptune and Uranus - as well the brighter clusters and nebulae. Galaxies... well there are a few you can get a glimpse of but nothing you'd write home about.
In this respect a 100mm refractor or 125-150mm Maksutov or Schmidt-cassegrain like the one you identified is an ideal start and you should get many happy years of use.
The other question is a mount to put it on, and eyepieces - with that budget in mind yes the scope you have in mind is fine, and you could use a few eyepieces; I'd suggest three - around 30mm, 15mm and 8mm.
A larger aperture say 250-300mm reflector (usually a dobsonian) is needed to get a good view of galaxies but that's only warranted IMHO if you have the time to travel regularly to a dark sky site 2 hours drive out of sydney - and that's limited by the moon phase and weather.
Suffice to say many here don't get the chance more than a couple of times a year and frankly I don't bother anymore. Hence have downsized to a 130mm refractor.
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