Aside from Assu and We Are (who came first) which delivered a very pushy artistic visual concept, I can only judge on the music. So it would be:
1 - We are
2 - We go
3 - Assu
4 - Over the top
5 - Bon Voyage
6 - Hikari E
And the rest..
Yeah, I'm a big fan of Hiroshi Kitadani