I received the 40 gig ATV for my bday yesterday, I'm returning it today due to it making an intermittent loud noise. I have $50 of apple credit remaining from my iPhone refund. Is it pretty much a no brainer to upgrade to the 120 gig? Or should I just use my 300 gig external HD as the backup store (although not as convenient)? Thanks, Andy P.S. - I'm new to these forums but have read a lot of topics that I found via google search when having issues or looking for news. Lots of good stuff here.