Hi there, welcome to the Shrapnel Boards, this one is usually pretty busy. Most people will quickly suggest the TDM-Modpack as a good mod for a challenge.
The consensus is that the United Flora Empire are the toughest, also the Rage, and I find the Aquileans pretty tough as well, all contained in that mod.
Be sure to give them a small or moderate bonus, to get them over the early game hump the AI tends to find itself in.
Get the TDM Mod Pack here:
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[ April 12, 2004, 03:05: Message edited by: Arkcon ]