XS forum looks for nothing but the very best..all of them are out of our reach, either financially or availability..
I tell you, if those guys heard what PSUs we're using here,         
The Gigabyte is a good PSU, but if you're buying it because of the sensor, you will be disappointed. The software to read the sensor is messed up, takes up a lot of resources, and hangs sometimes. All the PSUs you mentioned are good, with the only exception being the Enermax. In fact, most of them are already excessive for your system, and will easily last you 5 years or more.

Wah, sniper69..you got a lot of biased opinions there..
But you are still entitled to speak yours 

       
got myself Corsair HX620 today,
but not yet open to use...
still in nice pakaging,
will unpack and use it maybe next week...

       
bought it at a good price too,
at new unit at price RM4XX

penang lo,
know the boss,
the cost price are RM500+ one,
but I bring not enough $$,
and he said nvm,
muahaha~ 

haha, same price that I bought the HX620,
still considering wana use it or not,
short of fund right now,
and I am thinking to change casing pula 
Hope my acbel 460w can tahan if I change casing 1st then later change PSU...

One more problem,its very hard to find the HX620 now.Some of the distro said ots very hard to get now.

did some check up with at the PCP&C
those 750 watts and 550 watts are being oem by seasonic
means.. they mostly same with Silverstone.