Base Metals Options: ETF's? Indexes?

[kperrin]

Can anyone recommend base metal (specifically copper and nickel) or base metal index ETF's? I have found COPA (London) and DBB from Powershares. Any others?

 

[bgilbart]

Try XME, this should give you the exposure and liquidity you want.

 

[mktmkr]

comex in NYC trades copper, futures and options