I am looking to buy a 27" iMac currently the i5 model although if I order from Apple I may upgrade to the i7. I am trying to decide if I buy it from Best Buy or direct from Apple Online (from the student store). If I do buy it from Best Buy should I get their warranty on it or Apple Care? Or is the extended warranty not worth it. My local Best Buy has the iMac in stock and Apple Online Store shows a shipping time of 2 weeks right now. Any advice would be appreciated. I live in Canada if that makes a difference in any of this.