im ordering my MBP 17" i7 online and im at the hard drive step that being said, if i get a normal hdd and when i get it and put a new SSD inside do i have to re-install the os? and does the disk come with it? basically if i put the sdd in is it plug-n-play or do i need to re-install everything and buy a fresh mac osx disc??? also anyone have a tutorial??