Bro, kota damansara,cheras or setapak, these are prime area, I was was looking for property in these areas for the past 4-5month, and i end up in Emerald. Its easy to say than practically find a unit at these areas. Even you get lucky, for RM350k you'll only be able to get from sub-sales (old one), then you'll have to start worrying bout refurbishing the house. And besides that, although these area are nearer to the city, do you know that they pratically Jam during peak hour. As for setapak which i'm more familiar with, it jam even if its not peak, juz slightly better than peak.
May be you've take public transport into consideration, i dont know how often you take public transport, but i understand that in KL more than 70% of us drive. Further more, from the three places you've quoted, only setapak have better public transportation system. As for future developement in public transport, no one guarantee that it will run and even it does run, the question will be when will it be completed, 5/10/15years?Assuming that the developement is sucessfull, before it complete you'll still have to drive, and by the time it complete the road system in rawang will also upgraded.
So, you worry too much, if you want condo, with RM350k you can still try your quoted area (but good luck), as for landed (4get it). You wont find another emerald in Kota damasara or cheras, and definitely not setapak.
Sorry, for the long reply, not trying to shoot you. Just some feedback on your opinion.
thanks for info... we just sharing opinion... doesn't consider this as shooting rampage la