I'm considering buying my first Mac online from either Amazon or Macmall. I'm leaning toward online purchase to avoid the sales tax, even though there is a retail store 2 mi away from me. After paying for overnight shipping, I'm looking at a saving of about $110 if I buy online. So other than having it quicker, are there any good reasons to buy it at the retail store? I.e., retail offers incentives to negate the sales tax, or you can't bring the mac into the store for warranty repairs unless you bought it in the store, etc... I'm not a student/educator, so the back to school special doesn't help me. Also, if anyone can recommend some other good reputable sites to purchase a mac from, that would be great! Thanks in advance.