Okay, I'll start.
I have found that the Memento Ink works great with the PTI white cardstock that I use.
I would like to try Palette Noir ink next to see if the images are crisper.
I would also like to try Gina K's Luxury Cardstock. I heard it's wonderful for Copics.
Right now I only own about a dozen Sketch markers so they just sit on my table. I'd love to get the Making Memories lazy susan for them. But I'm afraid they would look so sparse and lonely that I would have to go out and buy a huge set. And my credit card can't handle that right now.