Welcome to the Forum! This article about cages for QPs from the companion site, quakerparrots.com, may help you choose the right cage for your new QP. My QP Ralph has a cage similar to this one and is very happy with it. The open tops can be dangerous though, so we never use it-- it's always secured closed. The bar spacing, as the article says, is important. 5/8 inch spacing works well with QPs.
I have the exact same one as easttex and my quaker loves it. I also have another large one in the kitchen with the open top just make sure that if you open the top that it is not liable to shut on its' own.