Hello I have a change to buy the 2014 proof silver Libertad 5 coin set for set for $160 (US dollars) in mint condition. I mean this set http://www.perthbullion.com/shop/detail/lib14prset5coinsc/ Only 1000 of these are made. I do not own any proof Libertad sets from the past but the set looks nice. I do not know about their future price appreciation potential or that are they easy to sell when the time comes. What do you guys think?