I just bought my first mac; a macbook air 13" with 2GB RAM and 128GB SDD. I bought refurbished for 450, but they have the upgrade of that with 4GB RAM and 256gb sdd for 650. I dont know if i should pay the extra 200$ for the other one. I will primarily use the laptop for school work like word, excell and all that and for my use which is watching movies and surf the web. I usually have around 4-7 tabs open, music playing, word open and maybe uploading pictures on facebook. I have an external memory but i just dont want to run out of memory and my computer to be slow in the future. Also, should i get a 3 year warranty for $150? I wish i dont have to since im low on money but how offten does MBA get defected? Need as much info as possible! Thankss guys