I am supposing this property is to be an investment & not your ultimate home. If this is the case, what I would do is as follows.
Get a loan for the max you can afford. Go interest only. Have an offset account setup alongside the loan. Put all your spare money into the offset account. This will have the effect of paying P & I, while keeping the original amount of the loan.
So, keeping to round figures, say you have a loan of 100k & you deposit $10k into your offset account. You will only have to pay interest on $90k. So at a later date, you can use the funds accumulated in the offset account to fund your next deposit (PPOR perhaps).