Its reasonable.
The 'best way' (didn't use it myself) is to make 3 characters of the same class, that way you can run high level content 3 times per week without worrying about having to get 3 sets of armor.
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I thought about that, but I just thought about the time of spend leveling up 2 more characters I could just spend doing raids or something else with my one. Thoughts?
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It depends on how much time you want to play per week. You can only get rewards from the higher level content once per week. The Nightfall + Weekly Heroic + Raid takes 2-4 hours depending on the skill of you and your team. After that, playing with your main won't give you the 'best' rewards.