ok thanks a lot. Not sure if paying for a better heat sink is worth the hassel if that much extra overclock would affect my performance in any drastic measure.
I hope my PSU of 550 watts will be enough for my build:
Asus nvidia GTX 560 Ti
Intel Core i5-2500K 3.30GHz
AsRock Z68 Extreme3 Gen3 Motherboard
Corsair 8GB of DDR3 RAM 1600 MHz
Corsair 128GB SSD
450 GB HDD
However its only i5. Will there be much difference from the i7 and this i5 in terms of performance for gaming? Also I'm not sure what it means by "unlocked"
Unlocked and unleashed means you got the ability to overclock the CPU. Squezzing more power out of the CPU. From stock speed of 3.3 GHZ-3.7 GHZ, you can increase up to 5.0 GHZ depending on the Vcore and the cpu cooler(air/liquid). Z68 chipset MB supports Intel SRT(SSD caching), Virtu Lucid(utilizing the iGPU and discrete GPU). When the new Ivy Bridge CPU will come, it is still be compatible with this MB, all you need to do is a BIOS update. Combine it with a decent GPU(nVidia or AMD Radeon), you got a solid and blazing fast PC that will last for at least 2-4 years.