In order from best to least best (but still very cool):
Tool-Assisted Speecore [TQBF Advance Frame Remix]
NEO SKY, NEO MAP! (made me started watching Nijigasaki too thanks to osu!)
Youka to Yumeutsutsu
UNION!!
Brand New Theater!
Brand New Stars!
Bookmaker
HUG AND KILL
Araki - Snow Drive (01.23)
Happy Time wa Owaranai
Fuzzy Future
High Free Spirits (Speed Up Ver.)
Ogura Yui - Peanuts!
Daisy Blue
Cycle Hit
Phantom Blood (Unlucky Morpheus)
I use them a lot in my jogging as the difficulty level depending on the songs' intensity www
Haachama chama~!!