Honestly, I think the Aspect of Glass is the best looking ship. I've gotten countless Dark Below ships from ROC strikes and the Crucible, but the only one I actually like from the dlc is Bane of the Dark Gods (Hard Crota ship) and I haven't managed to get it yet.
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It only looks good on the next-gen consoles though. I thought it looked terrible on my 360 before I upgraded to the One.