Investors always have to consider the trade-offs they are making when they pick one investment over all of the others available to them. Right now the buy decision around Enbridge (ENB -2.83%) isn't quite as strong as it was just 12 months ago. But this reliable dividend payer still has some positives to offer.Here's why Enbridge is still a buy for the right kind of income investor.What does Enbridge do?Canadian-based Enbridge is a North American midstream giant. It owns the pipelines and other energy infra ...