Some dubstep artists i have on my playlist are: Benga Chase&Status Datsik Excision Jakwob Katy B Magnetic Man Nero Rusko Skream Skrillex
A lot of those have done remixes of famous songs in the charts ect ect there easy to find. and theres also channels on Youtube just full on dubstep remixes :) sorry i can't help you with Techno and Hardstyle.
Abject Audio Damage Brennan Heart Blutonium Boy Dark Oscillators Dj Scot project Dj Zany Headhunterz JDX Noise controllers Southstylers Speedwave
I agree with Lizzie's dubstep list, but also add Bassnectar, Pretty Lights, Zed's Dead and Glitch Mob. Also, try listening to Deadmau5 for good dance music.
Calvin Harris and Swedish House Mafia
Thank you :)