Great post! Thanks for putting it all together.
I've got #s 3-8, although for #8, I have the 22mm SnP, which I love. I can use the GP ProRing with it, but I think it looks funny. Their ProRing is definitely better with the 23mm SnP.
edited to add: I second darkgear's comment - I have been using my KirFanis Privadero tank for over a week now (neglecting my others), and it is gorgeous. It has an integrated beauty ring, so it doesn't exactly fit here, but it is definitely worthy of mention.