If you don't mind waiting, i want to do a bit more research on your motherboard to make sure its compatible with custom cases, Hopefully I'll have the information for you by tomorrow at the latest. There are some issues with using Dell board in other cases; i found one person who did it but used a XPS 8100 so it does look promising but just want to make sure before you spend your money this time.
In the mean time, try looking at some different cases on newegg, find some designs you like and such, since it comes down to your preferences; your motherboard is similar to a mATX so pretty much any case will be able to hold it.
