Hey PT, need your kitties' expert opinions...

My boyfriend and I recently bought a house... which means a lot more room for the kitties (I swear, we bought the house for the cats). We have three huge bay windows that would be just perfect for a cat tree for the kitties to lounge on and watch birds outside...

So I was wondering what the PT kitties' opinions were on good, durable, pretty large and inexpensive (as in ~$100 max... I am operating on very limited funds with all of the projects we have going on at the house right now!!!). I've browsed around amazon and PetCo... some of the larger looking ones in my price range have poor reviews.

I am also not opposed to building our own, but with all of the projects we have going on at the house atm I'm not sure if I'll have time to!

Any suggestions would be fantastic......... thank you so much <3