Some will say there is no point in warm rinses, as detergents are apparently designed for and recommend it - however, *IF* the detergent manufacturers recommended warm rinses, we'd have the Eco-Nazi's hopping up and down demanding they change their recommendation for the sake of the environment! 

The other problem, very few machines manufactured in the last couple of decades are fitted with warm rinses, so you'd have customer complaints too! 

That said, I'd probably go for warm after the wash, since its more of a gradual cooldown. The final rinse would be cooler again and would therefore gradually cool the clothes, and not allow wrinkling to form as much, if my reasoning is correct.