If you think of green PCs as feeble machines scrunched into a microscopic form factor, you haven't seen the Dell OptiPlex 755 ($1,183 direct). Despite its sizable mid-tower frame, which offers plenty of room for expansion, the OptiPlex 755 has abundant green cred in its EPEAT Gold and Energy Star 4.0 ratings, the most stringent currently available. The 755 is useful for businesses that needs a little bit more than the standard desktop PC for their workers. Its dual hard drives give data redundancy to safeguard files. The OptiPlex 755 is a highly recommended business PC that also happens to be energy-efficient and environmentally attractive.