These 3 MLPs are great stocks to buy right now.For investors looking for high-yield stocks, one of the best sectors to invest in right now is the midstream master limited partnership (MLP) space. The companies in the sector are in strong financial shape and trading at historically attractive valuations.Given their valuations and solid opportunities ahead, you can invest a meaningful amount into these names, like $10,000, and collect some nice passive income for a very long time. Let's look at three MLPs to ...