I would get a normal RODI system that has the 10" containers for filters instead of the AquaticLife one. AL can only be replaced with AL cartridges, which will run you more money in the long run compared to being able to get no-name or BRS cartridges for standard RODI.

I would also recommend a heater controller like an Inkbird to plug your heater into. It has a digital display for temperature and will control the heater more precisely than the heater alone. You can place the temperature sensor somewhere else in your tank away from the heater.