I've decided to purchase a new 15" MacBook Pro with the 2.4GHz processor. Is it worth it to get the 8GB RAM over the standard 4GB? This will be my "main" computer (I have an iPad and an old iMac), but my main uses are really only internet browsing, wordprocessing and email. I know this machine may be overkill, but I want the larger screen. Also, what screen is recommended? Matte or Glossy? Hi-Def or Std?