MJ figures also used to have some 28mm not-stargate figures called Spacegaet. They still seem to do them in 20mm.
I was lucky enough to get hold of the first pack from Mo-Fo and the Jaffa came with a set of three different heads: bare, snake and (I think jackal). Would have loved to get the second half ot that SG-1 team though.
Also, Crocodile Games' "Aegyptus" range has some suitable figures for the Go'auld among their priest figures, like these: