I've heard:
1) Definitive StudioCinema 450 - These were monsters! Awesome clarity and lots of low end grunt, even without the sub. Very detailed, during demo of Elektra during forest fight scene, the ninja starts throne into the trees produced a very sharp sound and your could hear the leaves failing from the trees nicely. Retail for $600/pair but I can get for $333/pair.
2) Paradigm Monitor 3 - Very nice with music, listened to Sade Live DVD. The music was awesome, played a little more musical compared to the Def Techs but the Def Techs packed a bit more punch for movies. Very nice pair of speakers though.
3) Boston VR1 - My dad picked these up for a good deal. Not bookshelves but in comparison, the Def Techs packed just as much punch but were alot cleaner. Though I love the Boston sound.
4) M&K Monitors - not impressed as far as stand alone bookshelves go. Great with the matching center, but I'm looking to piece together starting with book shelves since I'm in an apartment. Once out in a few months, I will buy some rear speakers. Until then, need a dynamic set of book shelf.
My budget is aroung $300-400/pair for speakers. My birthday is coming up soon so that helps too
