I believe all it takes for separate accounts is a different email address and a separate credit card. Not even sure about the separate card. I have a few accounts with GoDaddy mostly for these occasions. As Namecheap has a special I just transfer everything over to them. Depending on Namecheaps deal I will get a domain for close to two years for $4-$5 or so.
BTW the discount for GD is still working. Just bought a .com, .net, and .org for $1.67 each out the door.