Photo Editing Software

Whats the best program to get for a non-professional. I been shooting photo's for years. 35mm I always used a lab. Then I got into the Point and Shot Digitals. I only played with software to touch up photos with. Now I got a lot of time to spend getting back into taking photos again. Not to make money, just for me. I current own a Nikon D5100 , 18-55mm, 55-300mm.
I have Corel PaintShop Pro x4 and Corel PaintShop Pro x5 beta.
I haven't jumped into the programs yet.

I look at this Forum daily and see most everything on Lightrrom, Paintshop and CSS. So what do you guys thing I should go with. I am asking incase I every need help with something. Using a programs you all use would help me better. Thanks