With gold turning down from its recent highs, some have questioned whether the 6-year bull market in metals may be ending. According to Mary Anne and Pamela Aden, the evidence points to the opposite conclusion. Indeed, they note, "Gold and silver have everything going for them and their rises have a lot further to go."

Here, the resource experts and co-editors of The Aden Forecast explain the six key factors they see that are pointing to higher metals prices.

The first two reasons are spending and money. They explain, "The world is swimming in money and that's the fuel that's been driving money assets and commodity prices up. But the magnitude of what's currently happening has never been seen before in world history."

The Adens points out that the U.S. is the world's largest debtor nation and "the government keeps spending money it doesn't have."

Since the government doesn't want to cut spending or raise taxes to reduce its debt, they note, "It simply produces money to cover its expenses, which is what governments throughout history have always done, and this amount is also huge."

In fact, in just over the past year, they observe, the amount of paper dollars that've been created is equal to half the value of all the gold that's ever been produced worldwide over the past 2,000 years, which is about $2 trillion. And it's not just the U.S. "Other countries are pumping out money like mad too. In Europe, for instance, money has been growing at the fastest rate in 17 years."

In my recent posts, I have been reviewing the most popular sectors for the coming year, according the the newsletter advisors who participated in the Top Picks from 2007 report. In my last post, I highlighted stocks in healthcare, tech, and telecom. Today, I want to review the resource sectors -- energy and metals -- that remain very popular among advisors, despite being out-of-favor in recent trading.

First, let's look at the metals, where gold remains a popular choice. Sy Harding chose ASA Bermuda, a closed-end gold fund, Curtis Hesler selected Yamana, and Martin Weiss opted for Kinross.

Pamela Aden selected the bullion tracking exchange-traded fund, the streetTracks Gold Trust; Mark Leibovit also chose streettracks Gold. Meanwhile, Mary Anne Aden chose the iShares Silver Trust.

Outside of the precious metals, Tom Bishop chose copper play, Taseko Mines, while Neil Macneale selected steel stocks.

Equally as volatile as metals -- and currently out-of-favor -- has been energy. The energy sector has been high on the list of Top Picks for the past 4 years. This year, however, there is a noticeable shift.