Well since you're not planning on overclocking now or in the future, you're better off saving money with an i7-4770 (non-K) with a H87 chipset motherboard.
You'll be fine with a cheaper psu. This is good enough:
http://www.amazon.com/dp/B006TVQTFE/?tag=pcpapi-20
Honestly, even 750w is overkill, but I couldn't find any decent 550-650w psu on Amazon for a good price.
Drop the Thermal Compound. It's a waste of money.
8gb of ram should be plenty for gaming. However, since it is an ITX build you'll only have two ram slots. So if you ever think you'll need 16gb, then get it now I guess. I would suggest you go for this 16gb kit:
http://www.amazon.com/dp/B006YG9EEW/?tag=pcpapi-20
It's a little bit cheaper but it's also low-profile in case you ever add a heatsink that might interfere with the RAM slots.