Re: Which to go with a 2600K or a 3820.
What exactly are you using the rig for?
If it's for gaming you're not going to see any difference in games based on memory unless you go with a 32bit OS or less than 4GB.
OC the CPU to 4+ GHz and unless you're playing at a very low resolution there's no way you're going to be able to tell the difference between a 2500k, 2600k, and 3820.
MSI MPower Z87 | 4770k | CNPS9900MAX-B | 8GB G.Skill 1866 | EVGA GTX760 |ThermalTake 850w | X-Fi Titanium | HAF | Asus PA248Q | Lycosa | Death Adder | Win8 Pro 64
MSI GD65 | 2500k | H50 | 8GB G.skill | GTX570 | Ubuntu 13.10
17" Inspiron | i5 | 4GB DDR3 | 500GB HDD | Win7 Pro 64