Value is in the eye of the beholder. There are plenty of coins that you will find by searching boxes which will sell for a premium on craig's list and ebay. At my local coin store they sell for 50 cents in Mint condition. It all depends on what you want to do? Create a collection, find coins to sell to others right now for profit, find coins to hold on to for greater return in future. Nearly any mint state coin can be sold for premium over face on ebay.
The one thing I would dissaude you from is collecting copper/nickel coins out of circulation thinking they will be worth more in future. It will take a long time and is not the best use of your money.
Case in point. In 1959 if you had gone to a bank and purchased $1 of mint state jefferson nickels (no mint mark, low mintage under 20 million) and put them away for the future. Then fast foward to 2011, they are now worth 50 cents each, your $1 is now worth $10! But had you bought one oz of silver for a dollar that would be worth $30-$50 depending on when you sold it this year. Better still, had you bought Exxon stock or ATT or other blue chips you likely would have done even better!
HH!