Personally I'd try the diplomacy first of all.. you can't really win against a Niefel rush.. you can just hold it back at considerable cost.. preventing that and hope to kill em late game when you (might) have more advantages/less disadvantages
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Want a blend of
fantasy and
sci-fi? Try the total conversion
Dominions 3000 mod with a new and fully modded solar system map.
Dragons wanted? Try the
Dragons, Magic Incarnate nation.
New and different undead nation? Try
Souls of Shiar. Including new powerfull holy magic.
In for a whole new sort of game? Then try my scenario map
Gang Wars.