Here are three stocks with buy rank and strong momentum characteristics for investors to consider today, August 27th:DaVita (DVA) : This company which operates kidney dialysis centers and provides related medical services primarily in dialysis centers and in contracted hospitals across the U.S, has a Zacks Rank #1(Strong Buy), and witnessed the Zacks Consensus Estimate for its current year earnings increasing 3.9% over the last 60 days.DaVita’s shares gained 11.7% over the last three month compared with the ...