I heard more and more Phoenix condos in USA is a good investment. Should I buy the condo in development or an existing condo?. Any idea about prices, areas, rentability, mortgage for Canadians?

I wonder how do you see the condo prices in Yonge area- Toronto in next 6 months decline or going up? How much per foot should be an existing condo vs . new one? how much should be the downpayment to leverage the investment? how many rooms is the most interesting investment? Fix or variable rate?