I'd be happy to help you out with that.
I think though that your budget is a little small for your requirements. All those inclusions - 99.9% uptime, nightly backups, 20 cPanel accounts and Sydney based servers we can do.
For $100/yr the disk space and data allowance is generous and for the price may mean you go on an overloaded server/network.
What's your actual usage on a monthly basis? Given that you have mostly personal sites do you see this increasing much in the future?
Jump onto our live chat and we can sort out a good deal for you