Jega
Lexaunculpt
ยต-Ziq
Nautilis
Luke Vibert (not strictly IDM, though)
Boxcutter if you're into dubstep (and his one album under his real name, Barry Lynn, as well)
Ital Tek (again, mixed with dubstep but good)
Vex'd (which is more dubstep than IDM but they're new album is great).
Last Step (which is Venetian Snares but more of his IDM side project)
And much more that I haven't gotten acquainted with yet.