Thanks for your quick review.
Looking at designbykai's comments too I think I'm more inclined to the T70, but I think I know what you mean that a lower resistance has a more 'direct' and easier to process sound overall.
designbykai says no sub-bass and the T5p definitely has sub-bass though, hmm... but he likes them with electronica... I'm curious...
Edit: Another thing, you know the Etymotic ER-4P and ER-4S? You can turn the ER-4P into the ER-4S with a cable, that might be the case here too, why not?