With only those two choices, and assuming cost is no issue, I'd go with the Corsair.
However, unless you have three GTX 580s in SLI, four hard drives in RAID, 32GB of RAM, two optical drives, and a large liquid-cooling system, you likely don't need that kind of power.
A relatively normal high-end gaming system would peak at around 400W or so, so a 650W power supply is just fine for that kind of thing. Add a second GPU and you might go up to a 700W or 750W.