I would suggest On1 - very easy to use, lots of adjustable presets - you can use them as is or customize them and save them as your own. The newest version reads and converts raw files. The full version usually costs $120, but is on sale for $100.

The other alternative, for about the same price, is the annual subscription to Photoshop and Lightroom, which is $10/mo.

There are other cheaper and free applications but none will produce the quality of the images you get with either recommendation. It all boils down to what your goals are and how much time you want to put into learning an application.

I've use On1's Perfect Effects for many years now, and currently own the 10.5 version. I intend to upgrade to On1 Raw when it comes out later this year. All that being said, I used On1 in a secondary role, as a plugin to LR and PS CC 2015.5. I believe On1 is seeking to become the LR/PS CC replacement and many folks are interested because of the possiblity that Adobe might up the price of the monthly subscription to a point where people might seriously think about dropping out. That is also why I keep current the latest version of PSP - I don't need to connect to my Adobe account online, and it will run ON1's software as a plugin, and I won't be stuck if I don't agree to the CC subscription rate hikes.

On1 has a first rate training team and will help you to learn their product. However, if your're used to offloading your camera's memory card to LR, there is a paradigm shift if you want to do the same thing in On1's Browser module. But, if it came to that, I would be perfectly willing to climb that learning curve if Adobe ever tries to shut me out.