Have you looked at AP cages? For a single boa I would get a T20 or T25, though you could go as small as a T8
http://www.apcages.com/home/
AP will set up the cage however you like. They sell heat tape with their cages, but they will install radiant heat panels for you or add screens for heat lamps/ceramic heat emitters if you prefer. They are easy to clean, stack (if you ever change your mind and get more) and I think they look great.
Pictured is the 8" stand AP sells, a T12, and a T8
Here is a thread I wrote on them:
http://ball-pythons.net/forums/showt...With-Pictures!
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