Hi Rex! I think I would use the 11mm for Helix, or the 40mm/Barlow combination. I was using a 21mm X-Cel ep, giving me a magnification of about 43x. Helix is much bigger than Dumbbell, and while it was fainter, it was very obvious in the view as a large, roughly circular grey shadow. Admittedly I had excellent dark skies, and I don't know how it would go with a bit of light pollution in the mix. As I said in the post, the longer I looked the more I saw of the brighter edges, and it became sort of 3-D with sufficient detail to make it recogniseable as the Helix.
I lobbed on it first-up, just using the chart in the Astronomy 2007 yearbook. If you have this, the 3 small stars shown that it is "mixed up" with were naked eye. These are between
δ Capricornii and ε Piscis Austrinii. I have a red dot finder, so I aimed the dot between two of the stars, in the position shown, and there it was. Hope this helps.
Cheers -