I'm about to buy the new iPad 64gb wifi model but i'm very hesitant because of the reported charging and overheating issues. My question is have these been addressed and/or fixed? I'd like to buy one before classes start in August so I don't think I can wait for the next one. And another thing, when I do go to purchase this tablet, is there anyway to avoid sales tax by shopping online? apple.com's estimating a $40 tax which I'd like to avoid. Thanks in advance!