I picked Glass no Pumps.
For me it's the complete package. It's got a real smooth R&B groove and I love the bass line(I love all Hirata Shouichirou's arrangements for Maki! hope he does the next single) plus I think it's one of Maki's best vocal songs, you can really tell how much she has developed. The dane is striking and unique, and the video was very very well done. Add to that LOVE Kan Coffee and the fact that it was the first single released after I discovered Maki and you got a single that holds a special place for me.
I did like Some Boys too, it was like a bunch of parts of songs pieced together and blended into one(not in a bad way, I started to really like it after a while
), same with the dance and video.
Ima ni Kitto was the first Maki video I saw, and it seemed kind of cheap, but Maki looked amazing so that made up for it.
I think the song ties for #2 cause I think it's a real good concert song.