Heh, no idea what Breakbeat and IDM are so I just throw it into a vague genre and throw own quotes to get the message across. Quotes really are the best way to be wrong about something without coming across as an ass hat.
Breakbeat can refer to a specific style of drumming, or a style of electronic music based on it
this is a good example of breakbeat drumming, and
this is the di.fm breaks channel, which is a good example of breakbeat music (and it's subgenres).
IDM is stuff like Squarepusher, Amon Tobin, Aphex Twin, etc. All that really messed up psychotic electronic stuff.
If you want a great resource for looking up a specific style of electronic music, I highly suggest taking a look at
Ishkur's Electronic Music Guide. It's highly opinionated about some genres, but it gives you a number of short samples of songs for each genre, and covers nearly every genre of electronic music. It's organized based on the couple major groups of electronic music, and there are some genres that are part of one group, but are linked somehow to another group, and he shows that as well.
Hell, anyone interested in electronic music at all should check it out.
As for Sneaky...
Well, you might like the
Alter Boys. Pretty weird mix of music, but I like them (you really need to hear more than just that song to pass judgement on them).
Or maybe
Kalmah They have some harsh vocals, but they're a unique mix of speed metal and gothenburg style. If you're not sure about that song, please check out
Moon of My Nights. It's easily my favorite song of theirs.
Another band you should check out is
Dillinger Escape Plan. They are pretty weird, but they've got some awesome music. One song,
Black Bubblegum Is like their take on a pop song, only with cool guitar work, and weird glitch sounds. You may not like the because of how grindcoreish they are (wikipedia calls them experimental mathcore, lol).
I'm not sure what else to mention. Maybe some
Candlemass (doom metal) or Carcas (
Heartwork or their stuff from Wake Up and Smell the Carcass (songs like
edge of Darkness)). Maybe some
Trouble. Trouble is "White Metal", religious metal, lol. But they do kick major ass.