My true recommendation is to get the 2.4GHz
I know it is $300 difference and that is not always easy. You won't be able to upgrade your iMac besides ram without taking it apart more then most would want to.
With the extra $300 you get a faster CPU and GPU and WoW should run much better, the new WoW expansion is coming out and with that the game will have more armor types in a area meaning it will have to load more data into memory and more data to process. Go with the 2.4GHz and you will be happy!
I know it is $300 difference and that is not always easy. You won't be able to upgrade your iMac besides ram without taking it apart more then most would want to.
With the extra $300 you get a faster CPU and GPU and WoW should run much better, the new WoW expansion is coming out and with that the game will have more armor types in a area meaning it will have to load more data into memory and more data to process. Go with the 2.4GHz and you will be happy!