Aggressive Chinese gold buying is "a big secular trend that's not going to end in 2010," Jim Cramer says, adding that with gold in short supply it could rise to $2,000/ounce. His favorite stocks to play the metal are NovaGold (NYSEMKT:NG) and Agnico-Eagle (NYSE:AEM). Chinese demand also is lifting copper prices, he says, which would benefit Freeport-McMoRan (FCP).