i would equal the cost of the colonies. Or as an alternative... you could tweek the colony mod ( just steal the colony stuff from it ) and have it where your initial colony costs 4000 , 2000 , 2000 and then the two other ones you reseach cost more

Or even greater in size

or something along those lines... A few options for you.
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Hey GUTB where did you go...???
He is still driving his mighty armada at 3 miles per month along the interstellar highway bypass and will be arriving shortly