It's true the further south you purchase the more the properties will increase in value.. but in Toronto, or Canada in general, only houses seem to increase at a rapid rate. You'll need to judge the developer and the location. If there are a lot of developments around the area, or potential developments, the property will probably devalue eventually..I'm living in a Concord Adex developed Tango (Park Place) building right now and have friends that have units in CityPlace and Tango Condominiums. Tango buildings have went up - this I can vouch for. The CityPlace locations by Spadina Ave in Downtown have went up year after year too.
You'll need to judge the lasting value of each property, or how long you plan to invest in it. After a while, only the locations with the best managed and best location will continue increasing.