I agree with buwish's suggestion although I am running a media center setup with imaged movies on my hard drive. It upconverts standard dvd to HD and is a top notch software imo. If your use is just to play blu-ray on your computer and you could card less about other features then you could look for a cheaper alternate route.
If you are looking for a feature rich, easy to use player with quality 2nd to none theres only one choice and thats cyberlinks powerdvd 10. Since I found this player 3+ years ago I haven't wanted to try another player, but thats for my needs and not necessarily for yours.
Read the charts and decide what you need:http://www.cyberlink.com/products/powerdvd/compare-retail_en_US.html