uni student wanting to buy an investment unit

Hi guys
I was just wanting to get some opinons on my plans to by a property.
I am 19 in university studying Commerce at UNSw, whilst working part time
at a Accounting firm. I have saved bout 23k so far (+money from share trading)
and would really like to buy a 1bd/2bd unit preferably in Sydney as that is where
im from.
Problem is that banks will prob only lend me bout 100k if I wanted to buy this and then rent ( i have spoken to HomeChoice/Aussie)
the unit out for about 200 buck a week. I have the option of working full time and doing uni
part time and working full time but still could prob only save bout 400$/week (living at home :) )

Some may think I should just relax and enjoy my youth but i really want to buy a property by the time
i turn 25 and before I buy a car.

The only place I can afford in sydney that is on a train line and less than 1 hr away is in Carramarr
or like Glenfield/liverpool for a low quality house with 1bd (155-180k)

Do you guys think im better of saving up more till i can get a deposit or what?/ or perhaps
by in a dodgier place ie. Newcastle or something?

Any constructive comments would be appreciated.
Cheers