The last one you've got in your little poll there sure is funny 'n all, except since you're stating it as a title, it's also the proper way to do it.
Roman: I, II, III, IV, V, etc.
Arabic: 1, 2, 3, 4, 5, etc.
I'm inconsistent :P
I'm a witless failed comedian who says "One, two, three, etc"
The last one you've got in your little poll there sure is funny 'n all, except since you're stating it as a title, it's also the proper way to do it.