My opinion is, don't skimp. A good gas stove or insert can last a very long time. Do you have a local store that specialized in gas stoves? They're more common in the north of the US.

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Mendota and Enviro are probably the best for quality materials, user friendly controls and great support for their products. They are a bit pricey compared to Heat n Glo. Rather than looking for a brand. Maybe look for a reputable dealer in the area and ask for their opinion. But Mendota and Enviro are great options nonetheless. More on reddit.com

It's burning fuel for heat. It won't be much more efficient than your existing system, and won't add heat in rooms beyond where the fireplace is. It's pretty but as a source of heat, not huge. My impression of them is that they are more for looks than performance. The money you would spend on installing a gas fireplace, spend that on tightening up your home instead. It'll probably be more effective and unlike the money you spend on a fireplace, money spent on improving airtightness and home insulation is money that you slowly get back, forever, in the form of smaller utility bills. More on reddit.com

I am guessing that first measurement is your width? My Suggestion is the Majestic Ruby or Trilliant. They both offer a good all in package out the box while also having a good traditional or contemporary design. They both are very easy to use and provide full flame height and blower speed control. You can even upgrade them to be used with your smart phone through your home wifi if desired. Ruby Trilliant Pretty much any gas insert you get that comes from a reputable brand is going to be electronic ignition and comes with a blower. So it will require power. If you have an outlet close to your fireplace already, there is no need to bring any additional power unless you want a power receptacle inside the firebox to hide your power cord for aesthetic reasons. Both of these units allow for your mantel to sit above it along with a TV above that. I personally do not find having a TV above your fireplace takes away any focal point if the function of your room is to have entertainment. If you and your family watches TV and movies there or your friends come over to watch sports, then that is already part of the main focal point of the movie. More on reddit.com