Tom,
Sorry didn't see this post so I answered here in Djrichie's thread:
Aquairum Plants List
As far as temp, I have seen Discus breeders keep there tanks from 80C-90C, so 82 is actually ok compared to most tropical tanks that are around 75-78C. Good luck with the tank and Discus. I plan on getting a few Discus in about a month once my 75g is fully established. I can't wait!