Which CPU Should I go for?

[doctorwho55]

I am in the process of picking parts for my second rig, this one oriented around gaming. I have been looking into processors and have a few questions. Thanks!

Questions:

Which of the following processors do you think is the most worth-it in cooperation with the rest of my specs listed below? i5-3570 Ivy Bridge, i5-4670 Haswell, 17-3770 Ivy Bridge, 17-4770 Haswell
Also, I plan to overclock my rig. Is there any real benefit to purchasing the "K" versions of these processors with the unlocked multipliers?

Specs:

• 
  Case: RAIDMAX Vampire ATX-001WBTi ATX Full
  Motherboard: MSI Z77A-GD65 LGA 1155 Intel Z77 -OR- MSI Z87-G45 Gaming LGA 1150 Intel Z87 (Motherboard based on CPU choice)
  GPU: Zotac GeForce GTX 660 ZT-60901-10M -OR- Zotac GeForce GTX 660 Ti ZT-60802-10P -OR- GeForce GTX 760 (To be released June 25)
  RAM: G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 1600 (I already own this RAM and just plan to transfer it to this new rig)
  HDD: Seagate Barracuda 2TB 7200rpm Internal Hard Drive
  SSD : Samsung 840 Series 2.5 inch 120GB SATA III Internal Solid State Drive (For booting off of)
  PSU: CORSAIR Enthusiast Series TX650 V2 650W
  Optical Drive: ASUS 24X DVD Burner

 

[Dark Lord of Tech]

4670K