Hey guys, I'm gonna buy a new MacBook soon(probably next month). I got some questions about memory replacement. Before the unibody notebooks, you could replace memory without losing the warranty. I wanna have 4GB of RAM, so I will have to do the replacement myself. May I replace memory without losing the warranty on a MacBook unibody? Also, memories specially designed for Macs are too expensive in the country I live(Brazil), so I would like to use PC modules. I did it on my actual MacBook. So, which module module should I buy? DDR3 @1066MHz? I can't pay 400 bucks for 4GB of memory, so if I decide to replace the memory I MUST buy modules designed for PCs. I forgot to ask. Which brand do you recommend?