hello! I bought my macbook back in February (just a week BEFORE their latest upgrade). I currently have 1GB of ram and I would like to upgrade it to 4GB, but I find the Apple memory wayyy overpriced so I'm looking for good alternatives. I see alot of Corsair ads so I downloaded their RAM scanner and a 4BG kit is only about 100 bucks... but I need your opinion : is it good memory? thank you!