Jeff, Persian rugs are the best!
Rich, when I started collecting about 10 years ago, I really tried very hard to buy only unrestored posters. Unfortunately it's not always possible to find an unrestored copy, especially for large sizes or rare titles, so over time I began to be more flexible. Still, less than 5% of the posters I have are linen or paper backed. The bulk of my collection is made up of US one-sheets, all of which are completely unbacked & unrestored. The second largest holding is comprised of French 47X63 posters, and most of them are folded (i.e., unbacked & unrestored). I'm more likely to buy a linen backed US 3-sheet or 6-sheet, or an Italian 4-Fogli because those come in more than one piece and are easier to frame when they have backing support, but even for those large formats I always prefer an unbacked copy.