It depens of want you'll do on your laptop. The XGA+ will be greater for photo editing, while the XGA will be better for reading. The characters will be bigger on a lower resolution ( 1280x800 ) than on a higher ( 1920x1200 ). For viewing movies, all options are good.

FOr the Wi-Fi, again it depends of your needs. If you play a lot of online games and share big files, then, the N will be for you. If you surf opn the Internet and send e-mail, get the Intel PRO/WIreless G solution.