What about an LA Marignon vs. Caelum game? They have vastly differing troops, but at the same time they're sort of similar. Strong archers, two main schools of magic, and units with an average resource cost.
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Just because you're paranoid doesn't mean they're not out to get you.
I do like the idea with the ladder, duels will be great, and we can play them much faster that standard PBEMs, just to agree some hours and you can play lots of turns each day...
Only question, who's gonna arrange this legaue