This is kinda hard to say, seeing as there are still a couple of pieces on order. But judging by what I've seen, have and saw online, this would be my definate list:
Evil:
1 - Ringwraith on Steed
2 - The Balrog
3 - Uruk-hai Scout
I never really got into the statues. I have a couple though (including Gandalfax and the 'wraith) It's hard comparing such a diverse range of pieces, I tend to concider the monsters and the riders as seperate ranges.