I would currently go with Espinosa. He's hot right now. However, keep an eye on him, as he's streaky and when he goes cold, cut him loose. If you think you need power, then clearly Hardy would be the way to go, as an alternative, but if you're looking for balance, Espinosa would be the best current option at least for his current hot streak. Alexei Ramirez is solid, but unspectacular (more consistent) as is Furcal, so those are two good fallback options for when Espinosa starts to struggle.
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