fishstick
Fish Crazy
What is the best live rock to get, and where from, mail order or lfs?
Just means you wait a little longer for it to cycle...
In theory, if the LFS/distributor is not lying to you, cured LR and LR from another aquarists tank are the same. Uncured stuff will take some time to cure if you purchase it. I agree with Musho, the best rock is that which you can find for a reasonable price with reasonable life on it, cured or uncured doesn't really matter in my experience. If the stuff from the established tank is very affordable (which it often is), I'd go with that.