I'll widen it to my top 3, solely based on my aesthetic preference:
1: Coalition Destroyer hands down. Attack submarine in space? Yes please.
2: The Serenity. I like the color scheme and I like the rugged-yet-stylish vibe.
3: The modern Spatial, which would look twice as rad if it took its color scheme from the Serenity. C'mon, they share manufacturers now.