Ceramic heat emitters are the BEST I've found for glass enclosures. A 60 watt ceramic running wide open would yield a perfect 90 degree hotspot and 80 degree coolside on a 20 gallon long aquarium for me running at your same room temp...that's the only advice I can give in that regard, make SURE you get a spare though as they do fail occasionally however.
You may want to consider covering the top of your enclosure with plexiglass (lexon) except for a few small vent holes to hold your humidity once you start using one though. Cut a larger diameter hole in the plexi to clear your lamp fixture that holds the che. It depends how much humidity is in the climate where you live but che's will dry out the enclosure faster.
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