OK, so I'm trying to decide between buying a 21.5 inch Imac or a 27 inch one. The specs are almost exactly alike for the models I want. Both Imacs have 8GB of ram, 1TB serial ATA drive, and AMD Radeon HD 6770M 512MB graphics. The only difference is that the 21.5 inch has a 2.8 GHz i7 CPU and the 27 inch has a 2.7 GHz i5 CPU. So, my question is whether I should buy the bigger screen or the faster i7 processor. Any advice would be helpful.