A villa in the NT, near the Uni should be around 50k/month, if you and your roomates can stretch it a little more than 75K will get you something real nice.
yeah helpers are cheap so do not hesitate, actually for that price you might be tempted to get two, if you are 3 ppl sharing the villa.
I drive a BMW but only on weekends - I have a driver that picks me at home otherwise on work days.
You will love HK and indeed it's a great place for later suppers..the city dun sleep!