I have half a box of a discontinued paper made by Museo. It is a 13" x 40" matte fine art paper that I use for the occasional pano. I find using this cut sheet to be much easier than cutting paper from a roll. It is the perfect paper for the 37.5" length limitation of the 3800 driver.
I was sad to see that paper discontinued -- it was perfect for printing panos with the 3800. I only have a couple of sheets left, so now I'm using Museo Silver Rag 24" x 36" which I cut in half to 12" x 36". I'd like to try the Innova Warm Cotton Gloss, but I guess they don't make large sheets.