I am making the move to Mac in 2011. Just makes sense with two iPhones and an iPad and being impressed with Apple and products for years. Should I go with a 21 inch iMac or a 15 inch MBPro and use an external monitor for more screen space at home. I am a casual gamer and interested in maintaining my photo and music collections. I will maintain connection with Word for work files. Would likely purchase a 13 inch MBPro or Air when the Vaio calls it quits. Any thoughts?