Hmm, Boards of Canada and Aphex both roughly fall into the IDM tangent (although Aphex leans into Drill 'n' Bass and Ambient as well), while Venetian Snares tends towards Breakcore, so I'd probably recommend (off the top of my head, so I'm probably missing heaps)...
IDM or related:
Detritus (particularly the album Fractured)
Somatic Responses
Autechre (Particularly Tri Repetae, they can lean towards glitch though)
Gridlock
Bitcrush (their latest album is ambient, but still great)
Scanner (also jumps between idm and ambient)
Subheim
Stendeck
Ambient or related:
Helios
Deaf Centre
Nest
Tim Hecker
Frost/Ben Frost
Hecq (Night Falls album, earlier were glitch)
Christopher Bissonnette
Eluvium
Muhr
Peter Broderick
Yasushi Yoshida
Tomasz Bednarczyk
Stars of the Lid
Breakcore or related:
CDataKill
Aaron Spectre/Drumcorps (as others have said)
Tarmvred
Datach'I
Glitch/Clicks (not really related, but if you like the others, you'll probably like this style):
Another Electronic Musician
I/O
TrenteMoller (a bit of a stretch perhaps)
Dubstep (the straight-forward stuff isn't great, but the more interesting stuff should be up your alley):
Burial
Ital.tec
Enduser
Boxcutter
Pinch
Fanu
Avant:
Contagious Orgasm
Lawrence English
Bernard Parmegiani
Philip Jeck
Pluramon
Instrumental Hip-hop (again, may fit within your tastes):
Blockhead
RJD2
Kid Koala
DDay One
Label wise, check out Planet Mu, Ad Noiseam, Hymen, n5MD, Miasmah, Room 40, Type, Warp (but that's very hit or miss these days), Kranky and the net labels are often good too (
www.serein.co.uk,
www.thinner.cc as examples)