If those games are anything more than like your basic flash game, then you don't want a laptop for that. There are several reasons for this ranging from the personal of cramped keyboards and generally low res and high response rate displays to the more technical like heat buildup issues. You want gaming on the go, look at Sony and Nintendo's portable gaming devices, otherwise get desktop unit for PC gaming. Not an all in one either, desktop.

So if you take any kind of PC gaming out of the equation and we're just talking something like Flash games, then an i5 or i7 won't really make any difference.