I have never used Rodinal. Am I missing out on something?
I am currently a D-76 user. I mix it according to the instructions and develop my 4x5's in a Unicolor 8x10 drum on a drum roller. Usually I pay little attention to the specific temperature, relying on instinct. I use this developer over and over until I feel it's exhausted and still I get what I consider printable negatives. I think it is a good general purpose developer. No complaints from my department. If maintaining exact temperature is a problem, maybe an electric aquairum heater would work.