Yeah I wouldn't include the standard cards on this list, personally. How are you supposed to assess the value of them? Obviously a Curse is the worst card in the game to buy, but Curses are obviously one of the best cards in the game when you're handing them out to other people. What about Provinces and Colonies, buying them is basically how you win the game, does that make them the best card? The only standard cards that you can actually debate the merits of purchasing versus not purchasing are Silver, Duchy, and Potion, but even those can't really be compared to kingdom cards.
I don't think I'd include the prizes either since they're tied to tournament and assessing their worth is difficult. I do like tournament a lot though.