I think we should start as Flex.. I'm sure someone could pull some numbers out their butt, but to maintain a consistant 10 man, it's something like 15-20 actual players, due to people not showing up, etc.
I know there may be some nights, due to baby, etc, that I can't get on, and other nights, I'm on early and stay on all night. Just the way things work out.
oQueue would allow us to pull in new people no matter what though.
Edit: And another thought, that I hope people are ok with some wipes. Example, I didn't dispel a single thing on my first Flex Sha of Pride. I had no idea I had to do it since LFR never needed it. I'm all over it now, and we killed the boss 2nd time through.
In the end, I think it'll be a better raiding experience for everyone.
I have a Mumble server that I can donate to the cause as well if we need.