I'm currently using Ranco's. I use 1 Ranco per 5 enclosures. My adult venomous and non-venomous snakes are housed in Animal Plastics 36x24x12 T3 enclosures.
Herpstats, Helix, Ranco, Johnson Controls, are all great. I do keep a few BAH-1000's around as backups/or temporary setups.