Oats are a head killer in my experience. Flaked barley really improves head retention, so I think it is great in Stouts. I would get Flaked barley from your local homebrew shop and don't worry about the Oats.
Hey Browndog,
What OG and FG did you get with this grain bill? And what volume did you end up with also.
I am hoping to have a crack at this this weekend.
Cheers
Jerry