won bros titanium. I spent a little extra to get the digital. It's nice because it's easy to set and a you always have a digital readout of the tank temp.
What you need to consider is the difference in room temp vs the desired tank temp. If the room temp is 68 and you want the tank at 80, that's only a difference of 12. So you just need to find a heater fo 120 gallons for 12 degrees. Theres a chart Ill post latter. GTG to work now.