La Ngoc, you seem to be chasing your tail a little and perhaps you need to separate your investment goals from your lifestyle aspirations. A PPOR is primarily a lifestyle choice and technically isn't an asset.
In light of the fact that you enjoy living in Essendon and have pointed out many of its positive attributes (I agree with you by the way), and you are seeking to grow your wealth, perhaps the answer is to keep renting in Essendon and invest in a suburb in which you and your partner think will achieve greater capital growth over time.
It is possible to build a portfolio of investment properties first, before you buy your PPOR. Have a read of this interview
http://somersoft.com/forums/showthread.php?t=27684
That way, you can put your investors hat on and select suburbs to buy in with the aim of achieving superior capital growth. Your own lifestyle requirements will be conveniently removed from the equation.
Remember though, capital growth is never a certainty and sometimes picking the highest growth suburb, next big thing etc doesn't mean that growth will transpire as you expect. If you read through other threads, you will see that active investors generate their own equity by adding value to the properties they purchase by renovating or developing.
Conversely, buying a PPOR in an area with historically strong capital growth has advantages. You can use the equity generated in the PPOR to invest and if you sell, you won't pay capital gains tax.
Regards Jason.