3/4hp is far enough power for any 2 normal car garage, even for insulated doors like the one your have. 1 1/4hp is usually over kill, typically you would see these on 10ft+(tall) 2 car garage doors, while your typical residential garage door is only about 7ft tall.
Also, to reply to someone stating that an LED bulb interferes with the signal, that is absolutely incorrect.
Edit: Also, just noticed someone's post about adjusting springs. Just because you have a new garage door opener, does not mean, you need to adjust your springs. This is rarely needed and is more for if the tension one either side is too much or too little (i.e. garage door not properly closing at the bottom). I've installed many garage door openers without the need of adjusting springs.
To add the Chamberlin model I mentioned and most newer openers have memory points you set during the installation. So, you'll "manually" (through buttons on the opener) move the door to the highest point opened, set it, then move it to the point closed, set it, then you're done, very simple installation and operation.