150k: Block of Units or house/sub-divide

I am new to property investing and require some advice from active investors in the Sydney or Brisbane area.
I have about 150k in cash. I would like to purchase property in the next 6 -12 months. I am interested in either buying a block of units 500k-700k(in Brisbane) or a movable house on an 800sqm block(in Brisbane) within 7km of the city and sub-divide. I am interested in cash flow but also capital appreciation (as most investors are).
As for investing in Sydney I would like to hear some suggestions as to how best I can use my equity to ensure that I get a capital return of at least 20% per annum over the next three years.