Welcome! I would go with either a BRS titanium heater or an eheim glass heater. I would then hook your heater up to an inkbird controller.
Ideally, a backup controller such as an apex would be ideal, but that is an extra luxury. With a tank that size, if your heater does not have anything to shut it off, it could be catastrophic. The inkbird is nice but it is a very cheap piece of equipment. If/when you get corals, id highly suggest a backup to the ink.
However, in your case you are going FOWLER so its not as expensive to replace a tank that has corals. SO, one of the above heaters and an inkbird!