If you want an estimated price of all the cards, I'd recommend using this site (Troll and Toad) to search the cards and find each of the prices, then add them up. The prices vary depending on the condition of your cards. Mint condition is perfect, (no scuffs, scratches, or anything,) near mint is very close to mint, (maybe one little scratch,) lightly played cards may have a few small scratches or scuffs, moderately played may have many scratches or scuffs, and heavily played cards may be bent or torn. You did say that your cards are well kept though, so I am assuming they are in decent condition, but that depends on your definition of well kept. I cannot price your cards without specific set numbers and pictures, because Pokemon card prices depend on what card(s) you are trying to sell and the conditon. Just remember, a card is only worth what someone would be willing to pay for it. I hope I helped!