After filling in the votes of the people who didn't re-vote in the public poll, here's my final count for Round 1:
Votes from people who split their vote are counted in full, 'cause, that's what the LJ poll does, and it's simpler.
The Mice: 1 vote
Arp 147: 4 votes
M51: 3 votes
The Antennae: 0 votes
Arp 272: 2 votes
NGC 2207 & IC 2163: 3 votes
Arp 87: 3 votes
The winner is...Arp 147!
If there had been a tie between this pair and another, this would be the pair I chose to win in the tie anyway.
So...Round 2 is imminent. I already have the poll made and the contestants lined up. It'll likely be revealed before you read this post.