I have a cookatoo and a grey, both are plucker's. Our Grey was a re-home 4 year old plucker( his ownwer before his died). We done everything we can think of and he still plucks, but not as bad in the begining. Other than that he's a great pet. He does fine with our 2 small dogs, and our other birds. For cage as the bigger the better! and about stainless steel cage none of our cages are stainless steel and we have two macaw's, but that really up too you. And you wanted know about other material playgym and tree out a good thing to look into also.