Hi. I'm new here. I have Prevue Hendryx cage and a Kings Cage for a cockatiel. I need to replace the Prevue Hendryx one. I've been told dimensions should be 24" long, 18" wide, and 24" tall with 5/8 perch size at the very least. I found a cage that is 20" length, 20" width, and 29" high. Also have been looking at larger cages by King's Cages and A & E Cages. Any thoughts on sizing and/or King's vs. A & E? Thanks in advanced.