WHAT TYPE OF SNAKE OR LIZARD SOULD I GET?

I currently have a columbian red tail boa, ball python, and blood python i would like to add to my collecrion i was looking at some lizards like a bearded dragon or a frilled dragon i dont want a huge lizard that will need 6x2x2 cage 55gal tops but i want a big lizard. also what type of snake should i get 8 feet tops and 4 feet minimum cage size doesnt matter so help if you can.