I really like the name Sadie. It has a sweet, cute sound to it.
Personally, I think Sadie Loren makes a nice combo, but I much rather prefer Sadie Lauren.
Some others that come to mind:
Sadie Alexandra
Sadie Elisabeth
Sadie Evangeline
Sadie Michelle
Sadie Caroline
Sadie Gabrielle
Sadie Isabella
Sadie Jasmine
Sadie Jocelyn
Sadie Kathryn
Sadie Lillian
Sadie Monica
Sadie Nicole
Sadie Olivia
Sadie Roselyn
Sadie Victoria