Be a bit more specific w/ your genres. I know of some good-to-great jungle, hardcore, darkcore, dnb, liquid dnb and breakbeat stuff, and some general techno. The only glitch artists I'm consistent with is Christen Vogel, but some of Luke Vibert's works fall into that as well. Almost none of my picks are obvious choices, tho (underground mostly even by underground standards).
I'm guessing breakcore would be like darkcore but more minimalist, right?
Com Truise, Booka Shade, 808 State, Prefuse 73, Mouse on Mars, The Future Sound of London, Daedelus, Nosaj Thing, The Field, Neon Indian, Orbital, Gold Panda, µ-Ziq, Squarepusher, Air, DJ Spooky, DJ Krush, Bibio, Matthew Herbert, Teebs, Meat Beat Manifesto, Joy Orbison, Baths, Takako Minekawa, Luomo, The Orb, The DFA, Fennesz, The Beta Band, Michael Mayer, Nightmares on Wax, Lindstrom, LTJ Bukem, Gas, Dntel, Flying Lotus, Tokimonsta, Gaslamp Killer, Thundercat, Roni Size, Vitalic, The Black Dog, Isolee, Goldie, Dosh, The KLF, Jean Michel Jarre, Caribou, Holy Ghost! [/huge fuckin' list]
I can't really help here (despite having several electo-obsessed friends), but my one piece of advice is to start with Kraftwerk. They're extremely popular, yes (or at least they used to be), so you've likely heard of them, but it's always good to start with a genre's pioneers to gain an appreciation of the genre at large. Autobahn would be the ideal starting point for listening to them.