Nah Mitcham is a bit far out. There is no reason why Mitcham-style developments couldn't be built in Preston, Coburg or Caulfied, and all be handier to the city. Whereas Toorak has many imitators but no equal.
Sure the Mitcham development is near the train station, but with trains only every 40 minutes on a Sunday night and only limited buses to the shopping centre at Forest Hill you'll still need the car for weekend trips.
Mitcham has nothing like the urban vibe of inner suburbs, and the Arts Centre isn't just a few minutes down the road on the tram.
Mitcham is a a solid enough suburb but a lot more people, if they had the choice would prefer Toorak. A lot of people aspire to live in Toorak; far fewer aspire to Mitcham.
Surely something like this in Toorak would be of more enduring scarcity value and higher capital growth than a new apartment in Mitcham?
http://www.domain.com.au/Property/For-Sale/Apartment/VIC/Toorak/?adid=2008192188