I know that there was a thread recently on "what's DR worth for armor bonus" or something, but I can't find it. Here is my specific dilemma: I have a cleric whose AC penalty I want to keep low, and whose speed I want to keep high, so I'm thinkin either of the choices in the thread title. Dex is 12, so that high max-Dex rating for the mithral is wasted, even with Cat's Grace or something. The breastplate is lighter and cheaper than the chain shirt, but the DR is naturally tempting. Strength is 13, for those of you tallying weight.
mithral breastplate:
4200gp, AC +5, max Dex +5, ACP -1, 15#
adamantine chain shirt:
5100gp, AC +4, max Dex +4, ACP -1, 25#, DR 1/-
mithral breastplate:
4200gp, AC +5, max Dex +5, ACP -1, 15#
adamantine chain shirt:
5100gp, AC +4, max Dex +4, ACP -1, 25#, DR 1/-