i7 2700k worth it?

Any reason why you want a Gen 2 i7? I don't know your situation, but you would better suited to go with a newer processor like core i5 4670k as will be cheaper, just as fast and more power efficient.
In terms of value, you want to post prices of your corresponding market so we can better asset it.
 


You won't really need to overclock the 3770k for any game in the market right now not even for AC unity. If you do plan on overclocking it just get a good cooler but if you aren't then you should be fine with the stock cooler.