Which bookshelf speakers to buy?


I'm in the market for bookshelf speakers. This will be my first step into a "real" audio system. I will be using these for music/movies(60/40). Considering making it a 3.1 system.

I've narrowed my search down to...

Onix Reference 1 Monitor Loudspeaker: About $500

Tyler Taylo Reference Monitor: $1000

Usher S-520: $450

These will be paired with a Pioneer VSX-1018AH-K 7 Channel A/V Receiver. Haven't decided on a amp yet.

Any help would be great.

Thanks
persisting1
Please check into the Ascend Acoustics Sierra-1s. They were better than my Tyler Taylos, and actually hung in there with My Tyler Linrooks(!) being better balanced and more musical (though not as resolute). Also search reviews of the Sierra-1s. I bought mine based on a review and thought it was spot on (I just can't remember which review it was). Oh yeah, and they are built like tanks as well.
I've been looking for a pair of Sierra 1s for a while now on here. Will keep and eye out. Thanks.