I've seen a few people trying to push the i7 recently, and I'll restate this again.

The i7 DOES NOT help you get better performance in any game. NO GAMES USE HYPERTHREADING in a manner that garners any sort of visible FPS increase. Most gamers actually suggest that you disable hyperthreading in the BIOS so it doesn't slow down your gaming.

Oh, it's $100 more than the i5 as well.

Here are some questions you should ask yourself:
Do I run a Fortune 500 database on my Gaming Rig?
Am I currently running simulations for medical research?
Am I currently farming my PC out for generic number crunching research?
Do I spend hours a day encoding/decoding audio or video?
Am I spending hours a day using the newest version of Photoshop to edit Gigapixel photos?

Notice how I said "hours" for those last two? That's because you would have to spend hours, multiple hours using those programs before you even saved a minute by using hyperthreading.

Before you drop an additional $100 on an i7 processor, you need to know that it will make ZERO difference in your Cliffs of Dover gaming. That money would be better put towards a $100 more expensive video card, or maybe a $50 more expensive video card and 2-4GB more RAM so you can create a RAM drive to help combat stuttering.