i diasagree with that
VX 450 is really more than enough. Just read the hardwaresecrets review of VX450's load testing and overloading. It can produce max of 44A on 12v rail at overloaded condition, still temps and noise is more than acceptable, and working at 80+ efficient on 127% load, which is 570W. In extreme overloading, the PSU just wont start....nothin ll ever explode or burnout unlike other PSU's like CM EP series. its got active PFC and lot other features at its core.
U can also consider Glacialtech 600 for 4.8k, which is almost as good as the VX, just that it uses caps @ 80c [like most other premium PSUs], while corsair modified the seasonic OEM circuit and caps with caps rated at 110c. Nothin to worry, PSU temps never gonna get past 80c, ever.
so my choice will be glacialtech 600[4.8k]>VX 450[4.2k]
badly, Antec EA650 SLI isnt available now, which was for 4.8k too and a seasonic OEM, just like VX.