Ah, buying a BluRay external hardware player is fine, if you do buy movies on bluray, and rent stuff. If you don't do that much, a mediaplayer like xtremer, popcorn hour etc is better.
HOWEVER, the best would be to combine both, mediaplayer like extremer + bluray player. That is what I am missing from the market. (I think they are out there but to expensive compared to using a computer for playback). Like a small cheap external computer that can playback media, is portable, has optical drive to read cds, dvds, blurays. Portable like small dvd-players. Perfect all-in-one machine.
P.S. Another bonus of having a cheap bluray player is that movies, TV-shows etc have come down in price fast, so they are not expencive to buy at the supermarket etc. Cheaper to download but compared to how high the prices was on DVDs, it has been way faster for price drops on blurays. That is nice.