huhu.. actually wut is da diff between expensive one wif given in casing one?

PCP&Cooling is one of the top PSU in da world man
if i able to get my hand on em( imean those which made by PCP&C themselve 1)

Now single rail with large Ampere is more recommended. Which brand u refer for Turbo cool?

my previous 65ZF also the same...but unlike u guys, mine never came back from the grave...it just...dead for no particular reason. till today, i dun really know what actually happened. still got the psu wrapped in the plastic bag

Its a good PSU, like OC4/3 said. The review by jonnyguru.com explains it in full. The only downside is maybe the software bundled with it, which as I've been told this problem has been fixed.
I don't recommend this at all, the voltage regulation is ok, but the ripple voltage at high load is off the chart. Under overclocked conditions, your hardware (especially mobo voltage regulators) could give way even though the voltage readings appears ok (its only obvious on a osciloscope). For details, read the review at jonnyguru, scroll though the list till you find it.
One glance and I know your PC doesn't even take 500W, much less 650W. Its probably around 450W only (you're not doing SLI right?)

Overclocked C2Q -200W max
8800 ultra superclocked -150W max
rest of system - 50-100W

The max values are as I said-max. If they actually took up that much power, even water cooling won't cool it down to comfortable temps (it'll be around 50-60C). Aircooling would be close to useless, even high performance 3rd party coolers will be running close to limits (70C+).

Give SilverStone OP1000e a try, now promotion price @ RM799 only