For what it's worth I've heard a few good things on the net about RDG's strawberry kush. I'm not sure if the few bits of praise I've seen are 100% legit. Most of the other strawberry strains I've seen have been reported as having medium potency.
If you have access to clones; which I doubt, you may want to look into strawberry cough. Just getting that out of the way now since someone is bound to mention it.
good luck.