It originally was the Kryptonite Interception, because I do really like that new Batmobile. But I've recently found out that Sky High Battle's Batwing can fold in on itself, and that's probably what's going to win me over. Plus: that WONDER WOMAN figure. The only figure I want more than her is a movie Aquaman figure.
(My goal for the end of this year is to get all of the comic OG Justice League Minifigures, plus their Superman v Batman counterparts).
Atmosphere is one of those things that is best conveyed in visual media. Even better in interactive media, but definitely visual. It can definitely conveyed in writing, but it takes a longer book and a very involved writer, and it hasn't really happened with the Bionicle books.
The animations had barely enough time to establish story, and left little to no room for just heavy atmosphere.
MNOG and MNOG II is what made the atmosphere in the old days, and there isn't an equivalent for this year yet. Check with me once the TV show comes out, that might change things.