This post appeared Monday on RealMoney . Click here for a free trial, and enjoy incisive commentary all day, every day.By Carolyn Dion NEW YORK ( TheStreet) -Instead of focusing on a single fund during a single trading session, I'm kicking off the first trading day of 2011 with five ETF plays for the year ahead. 1. PowerShares DB Base Metals ( DBB) Base metals are the final frontier for ETF investors, who have readily embraced an expanding line of physically backed precious metals in the past. While several firms -- including JP Morgan ( JPM), Blackrock ( BLK) and ETF Securities -- have filed to launch base and industrial metals, DBB is the only U.S. ETF that currently offers exposure to a basket of base metal funds. Base metals trailed their precious metal counterparts in 2010, but an improving global economy, an increase in construction, growing demand in emerging markets and a raft of upcoming funds will help to draw plenty of attention to this group in the year ahead. DBB tracks a basket of commodities contracts that is comprised of one-third copper, one-third aluminum and one-third zinc. By mitigating some of the single-commodity specific risk, DBB is a good pick for investors who understand the fund's underlying construction and are able to monitor their positions on a somewhat-active basis. Depending on the timing of new base metal fund launches, some of the upcoming funds may prove to be more attractive. If this is the case, investors may consider shifting assets when the time comes. 2. Market Vectors Agribusiness ETF ( MOO) Several key natural disasters and meteorological events will keep investor interest pinned to rising food prices in 2011. Whether it was the fires in Russia, floods in Pakistan or recent cold snap in key U.S. growing states like Florida, crops across the globe were impacted in 2010, and the pressure is on to meet the needs of a growing global population in 2011. MOO's underlying components -- which include fertilizer giants like Mosiac ( MOO), Monsanto ( MON) and Potash ( POT) along with equipment providers like Deere ( DE) -- will see an increase in demand in the year ahead as farmers set to make up for lost crops, look to profit from the elevated commodity prices and seek to meet growing demand from emerging markets. MOO is a well-balanced, highly-liquid pick.