Doesn't matter whether one gets a 7670m+Ci3 or 630m+Ci5 , won't notice any major difference in gaming. It'll almost be same.
Whereas getting a better CPU is always a good idea , if willing to spend the money.
No offense , but you seem to insist more on Ci3 than Ci5.
Fortunately there are Ci5+7670m based laptop in market as well.