Here's the case for why this "steady-Eddie" investment is still worth buying -- even near all-time highs. Some stocks have total-return charts that border on the edge of being art. Posting steady returns, seemingly year in and year out, these resilient businesses are proof of the mantra, "winners keep winning." One company that fits this billing quite well is leading public safety and enterprise-security services provider Motorola Solutions (MSI 2.94%). Since its spinoff in 2011, Motorola has more than doub ...