So, a friend of mine has a BCI that he would like to give up to me. I'm unsure of his age or size since I haven't seen him recently. I know for a fact he is outgrowing his current cage and is going to need more room.

What I would like to know is what cage dimensions do you like for your adult BCIs?

I was thinking about getting a T8 from AP but I am wondering how important height is to these guys? Should I go with something taller? Perhaps a T10?

Here is a picture of Greg from about a year ago: