Blu Ray is only worth the money for certain things though... A film with great battle sequences, explosions, gore or amazing special effects, I can see the point... a documentary or sitcom or real life drama or something... save yourself the extra 20 bucks and stick with the DVD as there won't be a massive difference.
I think Music DVDs kind of fall into that category, I doubt the experience will be that much enhanced by Blu Ray.
I know very few people with Blu Ray players... mostly PS3 owners, or media students...
Niv