Actually, you should go with the 3 females, because the maximum amount you can expect to make in the first season is several hundred dollars more than you could get from the clutch from the Pastel female. Plus, if the Pastel female doesn't lay, you get nothing. If one or two of the normal females doesn't lay, you still get something.
Maybe holdback some spider females, and sell the rest--use the money to buy an adult pastel female next year, and you get further ahead, faster.
Edit: My bad, I didn't read that they were already gravid by a het OG, and you were in it mainly for fun/hobby. The 50% poss het OG offspring would still be a bit of extra money, in spite of the bother, but if your main goal is to make pretty snakes faster, the pastel is a better choice).