Here's 10x10min wide field on the horse head. I should have got more subs as there's a bit of noise but I didn't realise how faint it was as I never imaged it before.
The full field is at
http://www.multiweb.com.au/astro/IC434.jpg
I had the same halo problem as Rob but I managed to remove most of it in in Photoshop. I posted two crops with halo and without. Got to perfect the technique but it looks promising.
You clone the Red channel in photoshop as a grayscale layer on top of your light frame. Make a selection around the halo in the grayscale image, feather the selection slightly then copy paste in a new layer. Hide the greyscale layer. Set the new layer blend to Linear Light then Fill down to 4%, then slowly set the opacity until you're happy with the picture. The only give away is the edges of the halo but I'm working on this last bit and will post when I have a solution.
If anyone has a good method of removing halos please let us know. Thanks.