Even though you have decided already, maybe someone else is looking. I did a lot of research this summer trying to find a tower or tree that would be:
comfy for sleeping (or Lily won't bother - won't sleep on a flat board, too uncomfortable for her)
fun for the kitties to get exercise
absolutely cleanable - very important to me
small footprint for our small house
lightweight for moving it around when needed
lightweight because of shipping costs to Canada
less than $300, including shipping, taxes, and duty costs
Okay, so it's kind of ugly but meets all the other requirements I had. I don't like plastic much but it is very cleanable, and is a good off-white color. Also no carpet that can get dirty or smelly.
This picture is right after assembling (easy), but since then I have made cotton-covered foam cushions and moved it to the corner with windows on each side. They LOVE it, seems they are always on it, lol!

I ordered it from Kuranda.com, customer service was great, product is excellent, total cost shipping to Canada was $249. The largest had one more nest (total of 9) but the weight put it just over the shipping requirements, but I've found 8 nests is plenty for us, we are very happy with it.