Father opted to buy the Pro and of course the 27" display, are there any known things to consider with this model? pros and cons? what to look out for? and anyone knows some promotions or somewhere i can get these discounted? lastly, memory upgrade needs to be done by Apple so not to void the warranty? I just wanted to buy the standard package with the 12gb ram i believe, since this beast cost tons of money and will just save for the upgrade soon.