I read somewhere about amps, would all the power supplies you recommended have enough amps to support the GTX 460.
Yes, that is "CORSAIR Builder Series CX600 ". Would be fine.
For GTX 460 power consumption google "gtx 460 TDP" without the quotes. You'll find it's spec'd at 160W (or roughly 160W divided by 12v = 14 amps). Your CPU ( i3 2120) uses 65W max (or 5 amps). All of the power supplies above (which are mostly 400W to 500w) would have no trouble driving this config even with a serious OC of the GTX460. The PSU you picked is a good one, 600W is overkill but it won't hurt you to have the extra headroom if you want it).
"Our test system is based on a power hungry Core i7 965 / X58 based. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc.
"Keep that in mind. Our normal system power consumption is higher than your average system. We'll take one reference card as example:
Advertised GeForce GTX 460 TDP = 150W (768MB) 160W (1024MB)
System in IDLE = 178W
System Wattage with GPU in FULL Stress = 307W
Difference (GPU load) = 129 W
Add average IDLE wattage ~ 25W
Subjective obtained GPU power consumption = ~ 154 Watts
You could also use a PCIe Splitter http://www.amazon.com/StarTech-com-PCIEXSPLIT6-6-Inch-E... but this defeats the purpose of the two 6 pin connectors which is to reduce the amperage through each point where a cable goes into a socket. (That why the molex to pcie has two molex connectors -- each carries half the amp load even though the source and destination are both the same place).