i forgot about some of the others, i only thought about the big two. the HCM PRO are very nice as well though they are very tiny comared to the other figures on the market, but are quite cool i recomend those as well. the EMISA are like the normal MSIA but are super poseable and seem to have very good paintjobs, also worth your money( if you plan to get any MSIA of the MK-II or Gouf just get these versions instead) the MMMGQ, are diecast toys those look quite nice, but something tells me you are looking at the normal figures and not the bigger diecast toys. the Arch Enemies seem like bigger versions of the MSIA (am i wrong?) you can find the seed ones cheap at KB toys lately.
chris