Where to buy laptops, gadgets, mobile phone, etc in SINGAPORE or dubai

Hi guys, I am planning to Singapore next week with family for leisure trip, so i will have very less time for shopping, so pls guide me the best place to buy the following things , Also pls mention whether buying from Singapore is worth than from Dubai , as i frequent Dubai...

1. Macbook Air / sony Netbook ( Never used a Mac OS , so wanna try out...)
2. HD camcorder
3. LED /LCD TV
4. iPhone 4

If you wanted to buy all these device then i will advise you to buy these from India itself as Singapore is more costly so might be you will be charge extra for this kind of electronic stuff. In Singapore most of the people buying the electronic item from the "Audio House " which is awarded by the Tourism board of Singapore.

Hows SIM LIM square? is there the things are cheap? Are there any "CHOR bazaar" like stuff in Singapore?

where to get a cell charger in Dubai for an N85 ?