Completely agree with tankguy. Anything easy, is easy for a good reason, they'll become a PITA.
The best looking while easy (hard to kill) would probably be a toadstool coral. Softy so not much light is required. Haven't done a water change in 1+ year and its still going. Don't follow in my footsteps though!
What I don't know much about is dosing of chemicals to keep mag/cal adequate. Been trying to find an informative thread about coral demands of cal/Maggie so I can understand at what point I need to start dosing while still doing water changes.
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