Replying to Buy me a laptop!

None of the threads ive searchbarred have matched my quest for a laptop so please dont say that...

I have no bias towards any brands or models (mac or pc), so if you suggest one maybe give a few reasons why?

I know nothing about RAM or whatever when it comes to computers so someone fill me in on a good amount of (____) to have in a laptop for my needs below, so it all runs fast and smooth

Basically the only things i need this laptop to do is:

-basic microsoft office programs like Word (only Word really)
-basic internet surfing
-capability for iTunes and max of like 10-15 gigs of music
-storing pictures (no photoshop, no video editing, nothing fancy)

And what about antivirus programs and operating systems? Any recomendations? thanks for any help thats useful!