For a 2600k, you really should not need to touch any "settings" or voltages other than the multiplier. Simply increase the CPU clock ratio, or multiplier, to 43 in order to achieve ~ 4.3 GHz. If you are having any stability issues, there are a number of guides to help you work through them. In all honesty though, 4.3 is a very modest overclock for the 2600k and you shouldn't have any issues with stability or need to run at a very high voltage.
When you make the adjustment to your multiplier, the BIOS will automatically adjust your voltage based on your CPU's VID. Once you've established that your overclock is stable, which it should be rock solid, go in and set your RAM timings and voltage as instructed by the manufacturer. After you've got that, you're good to go.
Some good tools to use are:
CPU-Z @
http://www.cpuid.com/softwares/cpu-z.html
Real Temp @ http://www.techpowerup.com/realtemp/
Prime95 @
http://files.extremeoverclocking.com/file.php?f=103
Essentially what you'll want to do is fire up CPU-Z to ensure your settings are proper for your overclock. After you've confirmed that, open Real Temp and Prime95, or other "torture test", and monitor your temperatures as Prime95 loads up your system. You'll want to let it run for a little while, the actual amount of time varies, depending on who you talk to, but if you're stable (No blue screens or errors in prime95) after an hour or two, its safe to say you've got a good overclock. Some people say you need a 24-hour "burn" to fully test the system, again this is subjective.
As far as temperatures go, since you seem to have decided on an air cooler, you'll want to stick around the 60°C mark if possible during your "burn." You can do this either by tinkering with the voltage or adding fans, if you're running hot. This is not to say that you cannot run at higher temperatures, the 2600k is certainly capable of performing at much higher temps. Simply put, when it comes to most electronics, the cooler it runs, the more efficient it will be and the longer it lasts.... I'm sure you know this.
In the end, I think 4.3 GHz is a very solid number to go with for air cooling. You'll increase the reliability of your CPU over more extreme OC's and should have no issues what-so-ever in regards to temperatures and BIOS settings. My suggestion is to read as much as possible in regards to overclocking before you adjust any voltages or settings.
In regards to your PSU, I am using a Corsair HX850 on a 2500k (@ 4.3 GHz) system with a pair of GTX570s in SLI, 16GB of DDR1600, an SSD, two standard HDD's, an optical and several USB devices. The PSU runs absolutely great and I highly recommend Corsair's power supplies. Use the following site to tally up how much power you'll need (This is a general tool and obviously not exact, but still accurate):
http://extreme.outervision.com/psucalculatorlite.jsp
Good luck to you!
Those stupid metal things don't do anything.
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