PC Peripherals Some questions regarding PSU, HDD, RAM and service centres

NoSaintAK

Recruit
1. I saw an article named 'How to build a budget Ivy Bridge PC' on Tech.FirstPost.com, where they mentioned Kingston 4GB DDR3 1333Mhz RAM worth Rs. 1400, however I couldn't find one for that price. Which company would be good for RAM?

2. Are VIP and iBall indian SMPS providers good? Why is it suggested to buy PSU with double the power of what's required actually for your PC? for e.g. Extreme wattage calculator gave my PC 200W but most people recommended Antec and Corsair with 450W. Please don't post article links rather just give simple explanation if its not too much trouble.

3. HGST had launched 1TB external HDDs with 7200rpm. Are they any good? Or should I go for 5400rpm ones. For HGST, who will provide warranty service and where can I take it for service. Can anyone tell me the service centers for HGST external HDDs in Maharashtra's Kalyan or Dombivli or Thane or Mumbai (if any)?

I'm desperate for answers. Thanks in advance.
 
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