Question for Ayu songs(DDR related)

[LX Ayu]

Okay, for those who play or know of DDR or listen to the music... some of it is catchy but you would rather hear songs of your choice like for an example Ayumi songs instead whatever the game has...

Well now here's your chance I suppose... for Step Mania I am making DDR songs and I wanted to make some more Ayu songs, however I can't decide on which ones I should use.

Because other people also can make DDR songs and likes Ayu here are the songs that CAN'T be used: Evolution, Naturally, Free & Easy, As If..., and Connected.

I have already created these two songs: Surreal and Daybreak(original version)

Now I am in the process of making a slow beat(80bpm) version of Rainbow and Taskinillusion.

Any suggestions as to what other songs I should use? I am looking for songs that when you tap your fingers to the beat or to what she is saying, it would make it seem like a hard song.

I am thinking of making these songs tonight: Never Ever, Real Me, UNITE!, and/or Independent with + added into it.

Any help here?

PS: Just a reminder... it's not very easy to make these songs... eachone will take anywheres from 4 hours - 3 days.