£1500? This could end badly lol.
It really is worth putting the money into getting a non-pikey/dog example. When a cambelt change costs £550, tyres £350 (i.e. all things which are absolutely essential) and rear pads/discs/bearings are £300 it's very easy to see why one 172 is worth £1500 and a seemingly identical one can be worth double.
I'm not saying pay absolute top dollar for a garaged all it's life etc example, but what I am saying is that it's no coincidence 99% of the "expensive" threads on here were from bargain-basement used/abused/pikey/ebay/chav-spec examples. It's a french piece of s*** blah blah blah - choose carefully and it'll be as reliable as any other car.