Yes, higher grade examples of the coins individually are worth more the generic set. You need to have a very good eye though to make sure the coins you are getting are actually above average grade. With these sets you have to be careful as they can contain whatever a previous owner decided to put in them. I've seen some nice examples like the '68 you describe but I've also seen some where the coins have gotten damaged as (as @OspreyCoins says above) the new containers are not air tight and probably weren't continuously stored in a cool, dry environment. Others I've seen are circulation coins or a mix of both. As the old saying goes, buy the coin not the holder.
If you haven't already found it, check out http://www.coinsandcanada.com/coins-prices.php as a place to start. And take all price lists (Trends, Charlton, C&C.com etc) with a grain of salt.
and enjoy!
If you haven't already found it, check out http://www.coinsandcanada.com/coins-prices.php as a place to start. And take all price lists (Trends, Charlton, C&C.com etc) with a grain of salt.



















