I currently have local rocks from a stream about..... 15 yards from my door (I really went hunting there!) and manzanita because it grows in abundance here in the tank now. Ive just thought about rescaping and always liked the look of that rock. Don't get me wrong, if I happen to see something ill grab it but seiryu is just on my radar.
On a side note, how exactly does cholla hold up in the aquarium? As a kid when I visited family in Tucson, I remember seeing it and it crumblied fairly easy, but then again it may have been there a while before I got to it.