Anybody with differing experience jump right in. From what I've seen... on the coins you list...
Pandas > ASE > Maples > Philharmonics
Pandas typically hold a very good premium to spot. I think even now, the lowest you'll get a 2013 is in the $26 + shipping range. ASEs are wildly in demand as a recognizable world mint coin. I place Maples slightly above Philharmonics even though the Maples tend to get those stupid milk spots on them because of the cleaning agent(s) the Royal Canadian Mint uses. Philharmonics are nice but just not nearly as popular as other world mint coins. The design is rather boring, which doesn't help.
If you've got somebody trading ASEs for Pandas, take that deal in a second. Trade all you can. Just make sure the weights are correct on the Pandas. It is the most counterfeited 1oz silver coin due to popularity, though.
Do you "work" for TOPPS?
Since no one answers phones, emails or customer service inquiries via the website or facebook, hit me up about that 2012 Jim Brown Five Star Autograph. Thanks! Initial inquiry sent Jan 2015. Months with no response - 2.