photoshop elements has always served me well. Its about 100 bucks. It doesn't process raw if you are shooting in that.
Lots of folks turning to LIghtroom. Not sure of the price and have never used it.
Photoshop CS? works well, and processes RAW image. I hardly post process so probably is overkill compared to what you can do with it. I think its like $800 or something like that. Seems crazy expensive