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Question: Netbook for movies as well

Dear Experts!!
I'm a student in Europe and I need to buy a netbook but I truly need it to be as cheap as possible(around 350-450$) but of course not to be too limited...but rather comfortable and functioal...the 10.1 inch size screen its ok for me...and weight isnt an issue...
I need it to be:
- Working Battery 4 hours and more
- to be able to play movies and sound smoothly and as well basic multimedia(not some super games) ,is it must be a super video card or smthing?
-Keyboard comfortable enough for Ms office typing
-Internet good wi-fi connection sensitivness

Thank you very very much!!!!
Marry christmas and a happy new year!!!:-)