Still, I think you should use the term "ancient Sith empire", since then you would be working with two comparable units and not a legion of individual Sith lords with amazing power versus the unit of Vong of indeterminate and unknown strength and numbers.
DF
Darth FaunusBoss
Sith own either way.
DF
Darth FaunusBoss
Janus, uh, go to the fav Jedi vs. fav Sith thread and help me pwn this dude.