I am switching to titanium heaters because I learned that they also serve as a grounding probe too. And I do believe they will be more durable.
@Notsolostfish I think the general rule of thumb is 3-5 watts/gallon, with larger tanks trending closer to the 3 watts/gallon. I also keep my tanks in a downstairs room that gets to the low 60's in the winter. I am planning a 150 and hoping two 300 watt heaters will do it. I'd be pretty confident that two 300 watt heaters would heat your tank no problem.
Whatever you get, I'd suggest some kind of heater controller to prevent overheating the tank if/when a heater fails. Inkbird is probably the best budget controller, and Ranco controllers are very well regarded, possibly "the best". Helios comes with the controller and titanium heaters and seems to be a popular choice here.
Last, if you haven't already, give some consideration to the electrical draw you're putting on whatever circuit(s) you're plugging your tank into. If you have a dedicated circuit or multiple circuits serving your tank, or you've upgraded to 20 amp service, you should be fine. But if you're powering your tank on a single, typical 15 amp circuit, just watch the load.
You never want to max out a 15 amp circuit with 15 amps of draw continuously, it's not meant for that, and that can be dangerous. Typically, a 15 amp circuit should carry no more than about 12 amps continuously. When both your 300 watt heaters come on, that's 600 combined watts, which is about 5 amps. What's you're lighting, I bet another 200 watts or so? That's another 1.67 amps. So now you're at 6.67 amps with just the heaters and lights (which are the two biggest electrical consumers on the tank). Now you have less than 5.5 amps left on the circuit to power all your pumps and anything else on the tank, plus anything else in the room that may be on the same circuit - a TV, lighting, vacuum cleaner, a hair dryer, etc. Just give some thought to the total draw so you don't blow the breaker when someone tries to charge their phone :)
Good luck!
