As soon as we move into a bigger place (next month fingers crossed), I want to get a huge cat tree. Coda, our younger female LOVES to climb and will climb anything and everything available. I know a big tall cat tree will be a huge hit with her.
I don't really know about Cal, our older male. He doesn't climb on everything like Coda does, but he does enjoy sprawling out in all his enormous glory on the top platform of our current, very modest (waist-high) cat tree, and he likes scratching on different surfaces, so I want to get one that offers some different scratching textures, too. I can see him actually using some of the mid-levels. Coda will probably just either hang out on the very top or race up and down it repeatedly.
Ugh, I hate living in such a tiny place and cannot wait to get into some digs where we can all spread out a little more.