Assuming the 25 coins are in a tube direct from the mint, what you are offering is a Mint State (MS) Brilliant Uncirculated (BU) coin. These coins do carry a premium over spot because they are issued by a government mint and
I think that your price of $37.25 is fair. However, a Proof coin is a special numismatic collector piece issued by the mint and is as much art as it is bullion and is accompanied by special mint packaging and a certificate of authenticity. Also, the only year the standard Silver Maple had a proof was 1989.
Annual variations for the coin in past have included proof releases (1989 only), privy marks, a coloured maple leaf (with a design different from the regular maple leaf), holographic enhancements and several differing designs, such as a 2009 issue commemorating the 2010 Winter Olympics.
http://en.wikipedia.org/wiki/Proof_coinagehttp://en.wikipedia.org/wiki/Canadian_Silver_Maple_Leaf