Depends on the individual animal but yeah, some dwarfs can still get to be impressively sized. I've got my super dwarf girl in a 6' cage as of yesterday. I could probably have kept her in a 4 footer but she would have needed a taller height than I had for her and I like to give my critters some space. Some people keep 15' snakes in a 6' cage just fine but I like them to have room to cruise around. Yes, RHP creates a hot spot, but also heats objects under them and in turn they give off heat and increase the ambient temps. Not trying to dissuade you from looking into retics, I love them. Just need to be aware of their growth potential and housing needs.
Edit: just saw bcr post. Yeah, some "dwarfs" are still decent size.
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