My suggestion would be to avoid certified aircraft (Cessna, Piper, Beechcraft etc.) and look to Sport/Experimental/Recreational aviation. This is because CASA will most likely in the future make more and more regulations which will make owning a certified aircraft insanely expensive, cheap to buy yes but very expensive to keep flying. An RV7 or RV9 can be bought for around the $120,000 mark, fitted with a TSO146 GPS and ADSB and you have an affordable to maintain, economical and fast aircraft. If you need four seats then save up a bit more and buy an RV10.