Looking to buy an iMac. Usage will be internet, iLife, Blizzard games, iTunes. This is the spec I'm considering. 21.5" 2.9GHz Quad-core Intel Core i5, Turbo Boost up to 3.6GHz 8GB 1600MHz DDR3 SDRAM - 2x4GB 1TB Serial ATA Drive @ 5400 rpm NVIDIA GeForce GT 650M 512MB GDDR5 Not sure I will see any real benefit of i7 or fusion for my usage. Any input would be great.