WHen i say smartest i mostly worth most for the price like if two skin cost 399 sg the other is worth 0.03 and the other is worth 0.20 then it is SMARTEST to buy the one thats 0.20 but it is also about how they look and im looking for skin up to well... around 500 sg
P90 grim battle scarred is pretty nice ;)
Any of the cobblestone boxes, because people use them to make trade contracts to get Dragon Lore