From the movie "Full Metal Jacket"
"This is my rifle. There are many like it but this one is mine." (go here for lots of other cool quotes from the movie)
I can say the same thing about cactus. There is a whole state full of cacti down in Arizona, but this cactus is on my little patch of land.
One thing to recommend about buying land in Arizona is that it doesn't cost a lot to maintain. You really can't get much hardier than a cactus; you don't have to water it, mow it, or anything else. And dirt is OK, too.