No progress in 3 months due to buying a house, moving, work, travel, cold etc. Finally getting started again. I still have not purchased batteries, but found a report that concerned me about the Deka Intimidators:
The concerns are with cycle life. From an initial purchase cost standpoint these are the best choice I have found considering my budget for this project. It looks like the issue with these batteries is when they are highly stressed repeatedly. In my application the daily DOD will probably only be 40-50%.
Conclusion: I think I am sticking with the Deka Intimidators.