It kind of depends on what you like - picking a case is usually done by most folks based on some amount of how aesthetically pleasing it is to their eyes, along with how it functions based on reviews and recommendations.
What kind of size would you like? Given that the MB is EATX size, you don't find too many smaller cases that can house an EATX board, so anything mid tower or full tower would be your best options.
Do you like sleek looking?
Rounded edges?
Square edges?
Straight lines?
Window or windowless side panel?
A case with a color scheme to go with your other parts?
Give some kind of information about what you like/want in a tower.
Finally, give a price range as well.
Isokolon :
Your board is an E-ATX board.
I don't think the 100r can house that.
I'd go for a Thermaltake F31
Good catch. I missed the "E" when I glanced through the specs for the MB - EATX