Why should Corsair is recommend for PSU rather than other brand

The Powercool 650 watt PSU puts out 30 amps on the 12 volt rails. That's about what a 450 watt Corsair PSU puts out.

A 650 watt Corsair puts out around 50 ampson the 12 volt output. Plus a 650 watt Corsair will put out a bit over 750 watts before it shuts down.
 
DellUser1 is correct. Similar features does not mean similar quality.

I took a look at the two web pages you provided. Important technical information is missing on both of those pages.

A high quality 500-550 watt power supply can easily power any single video card made. You do not need a 650 watt power supply for a HD 4800 series video card. Here is a link to a technical review of the Corsair VX550 power supply which comes with two PCIe 6 pin video power cables:

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=62

 
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which Watts should I get, just for overclocked ATI 4890 and overclocked newer graphic card with higher wattage use like 650W or higher. I only reply on single card since crossfire aren't supportable for all-around use.
 

theAnimal

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which Watts should I get, just for overclocked ATI 4890 and overclocked newer graphic card with higher wattage use like 650W or higher. I only reply on single card since crossfire aren't supportable for all-around use.
As mentioned by JohnnyLucky, the Corsair VX550 is plenty of power. There is no single GPU that uses over 200W, and most are less than 150W.