There is a reason why Mont Kiara prices are not that high compared to other areas. Oversupply is one thing but other than the international schools, Mont Kiaras primary drawing power is its branding.

Taman Desa and Kuchai are expensive due to location. Even these areas are considered rather "old" but they are centrally located in the Klang Valley future center of gravity. KL South is really hot right now due to being the center point between Putrajaya/Cyberjaya and Kl city center. Also Tun Razak Exchange and the Sungai Besi Airport redevelopment are all towards the south of KL.

With MRT 1 and MRT2 heading south and the high speed rail terminal at Sg Besi, the Klang Valley center of gravity is shifting further south. This makes areas to the North of Klang Valley not as attractive from an investment point of view.

As the financial centers shift so will the expat population. Mont Kiara is a nice place to live if you are willing to spend the money. But investment wise money could be better spent elsewhere.

Even not so nice places like Kuchai have higher upside due to its location to the south. Kuchai/Taman Desa are extremely closeby to the Sungai Besi Airport redevelopment as well as to the new commercials in KL South such as Bukit Jalil City and Wct Paradigm OUG.

If purchasing for future potential KL South makes more sense than KL North like Mont K. Since your money is hard earned, it's your choice if you want to pay for a property that has limited cap gain and rental potential located far from the future Klang Valley centre of gravity.

Life in Mont K is good, but look at the opportunity costs.