I am going to buy parts to assemble a new PC this summer. My first priority is gaming. I already own a monitor. I have made two builds on PC Part Picker I will link. I want to know which is the better overall value. As this is my first true on my own build I would also like to know which might be easier to assemble and manage cables.
Both are great choices, the itx build will take a bit more effort to get tidy but I've built one in the same case and it's not too bad really. Consider the length of your PSU though it can be a bit tight with the longer ones. I'd go for an i5 personally , not because the i3 isn't a very capable gaming machine but because 4 threads are rapidly becoming the norm and games are starting to take better advantage of it.
I'd also stick with the 670 if possible it's faster than the 760, in fact I'd go for a non K i5 with a stock cooler if that would save enough cash to get the 670. Overclocking is cool and gets you a performance boost but in truth you don't need the performance for gaming and will see little real world benefit from it. My overclocked i5 defaulted back to stock clocks after a BIOS update and it was weeks before I realized - no noticeable difference in practice.
For my current build (in that bitfenix case) I decided to get an i7 3770 instead of an i5 3570K with an aftermarket cooler. When you factor the cost of cooling into it the price difference is nothing.
so in summary, i5 non K, 670 or better, 8Gb of RAM = can't go wrong.