Keep my level 23 titan
Play as my level 16 blade dancer
Start a warlock
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Honestly, level all three. I leveled a Warlock to Light Level 22 in two days. Decided I missed playing a Titan from Beta. Leveled that one to Light Level 21 in two days. If you level all all three to at least 20, then you have options, should you receive gear for one class, but can't use it on the one you obtained it on.