You can visit my website too www.hartanahzico.com :)
As an investor and an agent however, these sites are the best for me:
1. Propwall to get a gauge of the property and the area
2. The Edge Property to get technical data i.e maps and reference price
3. Mudah its the easiest place to find below market properties
My no 1 site to get real raw information is Lowyat. There were times that I wanted to buy or have booked a property that I did not due to the information you get from there.