Trade-in?

Im thinking of trading in my premium for an elite. However, I am wondering how much I will get for my premium, and how much I`d have to fork out for the elite.

If this questions could be answered, id be greatly thankful.

120 gig hdd is like $180ibanezdropd

You can get them new on eBay for $140 shipped. That's what I'm doing. I'm happy with my 360, I only need more memory so buying the HDD is right for me.