Confused on Yongnuo for Canon 1D IIn

[Bend The Light]

I need to get hold of a flash for my 1D mark IIn. I will be using it ON the camera, not as a slave. I can't afford Canon brands so I have been looking at Yongnuo. I read a few reviews and the spec on some of them, but am left confused as to which will work on the 1DIIn.

Has anyone used Yongnuo flash on a 1DIIn. I would prefer to have TTL rather than manual.

Let me know what you think? Any advice taken...also if there are alternatives out there which I should consider...

Many Thanks