I am going to start up with some Jax here soon as well. I am attarcted to all three subspecies... and will keep them all at some point... but now I am just deciding which one to start with. I have been very tempted to jump on some J.J.'s lately just for the simple fact that they are around and can be found right now.
As for my rack... I am going to post a vid later today with it...but it's a 7 1/2' tall, 2' deep x 5' wide chrome U-Line rack. It has four shelves to use. I imagine with smaller cages I could find a way to utilize all four shelves. (I have TALL vaulted ceilings.)