Amateur editing software?

I have always loved photography, but have only recently gotten my first camera (Nikon d3100) I have so many ideas for photos, but they require editing. I see beautiful edits on flickr and instagram and other sites ( I love lizmonster and irelandluke 's work), and I was hoping that you could recommend a software? Preferably not over $100, I'm on a rather tight budget.

Photoshop Elements 11 - research it at the Adobe website.

Compare prices too at Amazon, BestBuy and Tiger Direct - as well as Adobe.