Do a format/clean install the second you receive the imac 27? I would personally rather do it that way (after the first start up to see if everything is fine first obviously) Cause im sure you are able to choose what applications you want to install etc right? I never had a mac before so thought i'd ask. Also is the process easy? and im also able to create a partition just for the install say 12gb for it, and partition the rest in 2 other drives?