Home Premium would probably be plenty for your laptop and your needs....IF you dont have any Ultimate keys left.
This also assumes you dont need bitlocker, ability to join domains (still can use HomeGroup ofcourse!), advanced backups (Acronis is better anyways), multi language support or need XP mode (I prefer VMware personally).
Here is a decent chart for dif options you lose out on w/ HP vs Pro vs Ultimate :)
Which one is right for you? - Microsoft Windows