So I pulled the trigger and bought:
i5-4670k
Asus z87 plus mobo
8GB of GSkill RAM
2
Noctua NF-F12 fans to stick on my Corsair H60
Corsair HX750
All that replaced my AM3 mobo that had my Phenom II X3 720 on it and my old 550 Corsair VX power supply.
I took a chance and just cleaned out any AMD drivers before just installing the new motherboard, CPU and memory. And it booted up fine and Windows recognized the new hardware without any issues at all! No need for a clean install or anything.
And going from an X3 720, even an unlocked and overclocked one, to the 4670k is like night and day. Especially in Rome 2, the difference is staggering.
And the Noctua fans are incredible! I have them set up on my old H60 as push/pull and they're so incredibly quiet, yet move a nice amount of air. I'm a sucker for nice packaging and the Noctua's come in some nice little boxes with a ton of nice extras. Just super high quality.
Same with the HX750- it was so much nicer putting that together with the modular cables than my old non modular power supply. Still have to do some cable management but its already less cluttered than before.