Mine is BRS Fiji rock. I really like it. I got it from another member here instead of having it shipped. I would have gone with either the BRS rock or reefcleaners if I was ordering online.
Another one for Marco Rocks - pretty clean and easy to scape with (while dry, at least). But I've also eyeballed cerameco (VidaRock) sculpted pieces from time to time and might use that next time around.
Pukani from BRS or Marco Rocks. I like Pukani because its so easy to wok with, flatside or carve it to fit your needs and its does not weigh much. Here are some pics of my latest project, the one large piece is about 40lbs.
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