What do you mean about wifi? If you are gaming you want to connect your computer directly to the router--wifi internet isnt reliable enough for gaming. If you are talking about other wireless components windows 7 ought to be able to find them through the router.
From Tom's review:
Past the Point of Reason:
With rapidly-increasing prices over $200 offering smaller and smaller performance boosts in games, we have a hard time recommending anything more expensive than the Core i5-750. This is especially the case since the Core i5-750 can be overclocked to great effect if more performance is desired, easily surpassing the stock clock rate of the $1,000 Core i7-975 Extreme.
Perhaps the only performance-based justification we can think of for moving up from a Core i5-750 is that LGA 1156 processors have an inherent limit of 16 PCIe lanes for graphics use. This is an architectural detail that the LGA 1156-based Core i5 and Core i7 processors share, so if a gamer plans to use more than two graphics cards in CrossFire or SLI, the LGA 1366 Core i7-900-series processors are the way to go.
To summarize, while we recommend against purchasing any CPU that retails for more than $200 from a value point of view, there are those of you for whom money might not be much of an object and who require the best possible performance money can buy.
http://www.tomshardware.com/reviews/best-gaming-cpu,2520-6.html