The pre oc'd bundle would the quick and painless way to go.
However, its very easy to overclock the 2500k. Starting with a small overclock, testing stability and then pushing it a bit further is the best way to go. There are several posts on the forums here that you can use for reference.
Be aware that the G43 G3 doesn't have an option in the bios for manual cpu voltage adjustment, and so 'Auto' is the only setting. That being said, the Auto feature has worked a treat with mine so far. Much better than other boards that I've had which seem to think that 'Auto' means wiring it's nipples up to the mains.
You can also use the 'OC Guru feature' which will set your bios and clock the chip at 4.2. This will turn off all power saving features though, such as c1e. Surprisingly enough, it actually does work, and isn't the usual half hearted gimmick.
However, its very easy to overclock the 2500k. Starting with a small overclock, testing stability and then pushing it a bit further is the best way to go. There are several posts on the forums here that you can use for reference.
Be aware that the G43 G3 doesn't have an option in the bios for manual cpu voltage adjustment, and so 'Auto' is the only setting. That being said, the Auto feature has worked a treat with mine so far. Much better than other boards that I've had which seem to think that 'Auto' means wiring it's nipples up to the mains.
You can also use the 'OC Guru feature' which will set your bios and clock the chip at 4.2. This will turn off all power saving features though, such as c1e. Surprisingly enough, it actually does work, and isn't the usual half hearted gimmick.