If I had to do it over, I wouldn't get the SW with all the various papers as they are not the size I want to use on a larger format printer. I have been buying some Breathing Color sample 20' roll papers and cutting to the desired length, then setting up the printer to Custom sizing. So far, the longest I have printed is 34 inches. I resize the photo using Photoshop. I use a RotaTrim cutter as it is critical to have a square cut to avoid paper skew. After cutting the desired length, I D roll the paper to take most of the curl out for easier paper feeding thru the Rear feed. I made a D roller out of some 2 3/4 inch PVC pipe and some white cotton cloth, but one can be purchased for @ $250! I suppose one could also cut the paper ahead of time and press it between some flat surfaces for a period of time. I let it set in the D roller for about 30 minutes.
Red River has some great papers up to 17 X 25 available plus 17" rolls. I found their Polar Pearl Metallic and Arctic Polar Gloss to be very good. It's a pity that Epson only provides 17 X 22 precut sizes.