Wow. Every month it's hard to vote, but this one was REALLY hard.
I ended up voting for the Solur Nexedifice, because OMG the detail. It's gorgeous. My second vote went to Sapiento's Air Nexus; I love the surrounding city and those Aether ships rock.
Every single entry was awesome this month, about to go spread a bunch of rep love around. I wish I had 6 votes.