If you like Knife Party, you might like the band's main project (Knife Party is a mini-project by two band members from a group named Pendulum.) They do fantastic drum and bass. Immersion, their most recent album, may be their best.

The Island Pt. II: http://www.youtube.com/watch?v=CBIYl88Zwyc Witchcraft: http://www.youtube.com/watch?v=AooMCiV2eb4

Their other albums, In Silico (Showdown, the Temptest) and Hold Your Colour (Slam, Blood Sugar) are also fantastic. My favorite band, personally.