[DigitalS3r4ph]

Kil's Thermosphere
Aperson's Peaches En Regalia & Vunderbar (Dorian Concept Remix)

and Tsuka Bazooka. Because to me, it is.

EDIT: I also forgot Hardware Store by RaiRai. That file is godlike. There are a probably quite a few other files that I think are perfect but it's been a really long time since I've played on a regular basis.

Peaches En Regalia changed the playing field for what people thought was possible with making fun charts. If you were around at the time, it prompted a lot of step artists to think more creatively and literally step up their game. IMHO Thermosphere wouldn't have existed without it, because Kil literally stepped that file for a pack that Aperson was planning for creative and perfectly well-polished files ONLY, after Peaches En Regalia was so well received by the community.