Gold ETFs sparkled Thursday as the U.S. dollar sold off on weak manufacturing and housing data, spurring hopes for more quantitative easing. Here's a performance overview of the key ETFs involved: PowerShares DB U.S. Dollar Index Bullish (UUP) dropped 0.44%. SPDR Gold Shares (GLD) rose 0.74% to $156.79. Market Vectors Gold Miners ETF (GDX) jumped 2.60%. Market Vectors Junior Gold Miners ETF (GDXJ) leapt 2.91%. Strategists' outlooks differ.