I have a 17 qt Presto pressure canner/cooker and it works great. My in-laws gave it to me around 12 years ago and I have not had any trouble with it. I only use it for canning.
The model I have has been discontinued in favor of a 16 qt model, which actually holds more jars than the 17 quart. It must be shorter and fatter. These are just the right size for a typical household range. There is also a 23 quart version for 10 dollars more on Amazon. The 23 quart canner lets you double stack pints, but holds the same number of quarts. For the $10 extra, I would get the bigger one, myself.
I would go with the Presto again. They are reasonably priced, basic, and easy to use. There are other more expensive cookers/canners, but this one does exactly what it needs to do for canning.
https://www.gopresto.com/products/products.php?stock=01755
http://www.amazon.com/Presto-1755-16-Quart-Aluminum-Pressure/dp/B000QJJ9NY/ref=sr_1_3?ie=UTF8&qid=1436239714&sr=8-3&keywords=pressure canner
How they work - Put an inch or two of water in the bottom and start it boiling. Lock the lid on. After there is a steady stream of steam from the vent, plug it with the weighted cap. Keep the cook top on high until it reaches your desired pressure and then turn it down to ~1/4 on the dial. That seems to hold stead for my electric range. When the desired time has elapsed, you can let it cool down to normal pressure on its own, but that will take an hour or more. I use a tongs to pull the cap from the steam vent and let it vent off until the pressure equalizes. Pop the lid, switch jars, and go again. The jars are hotter than hell, and will actually boil on your counter for a while after being removed.
Get a basic canning kit if you don't have one, you will be happy you did.
http://www.amazon.com/Ball-Utensil-Set-Colors-Vary/dp/B001NNJ42I/ref=sr_1_5?ie=UTF8&qid=1436240808&sr=8-5&keywords=canning kit