Suggestions for bookshelf speakers that have great dynamics, budget of $500 used.

I heard the Haydns at a dealer quite some time ago. I thought they sounded very lush, somewhat warm, refined. Good looking speaker. Let us know what you think of them. 

Mesch
I cannot say as I would describe them as lush or warm but obviously a lot of that is system dependant.
I would say they are warmer on the very top end than the Silver 3i which is not a bad thing.
Mids sound about the same with vocals and acoustics being well detailed.
The bass might be a tad deeper but does appear to be more defined, especially as the volume is pushed where the Silver 3i could start sounding a little harsh and more "boomy"
Do not get me wrong the Silvers are mighty fine speakers for the money and I am talking louder than really comfortable levels and they are in a fairly large room.
Overall I am pretty happy with the Haydn,s.

ELAC?

I had some Haydn Grands and liked them at first, but they were lacking treble (too warm) and kind of boring (not very dynamic) after listening to them for a while.  They are pretty.  I had them in my bedroom, and maybe that was too large of a space for them.  They might be good for a desktop system.  They're the polar opposite of the Monitor Audio sound, so I can see how they might be a good fit if you didn't like that sound.

Greg
Obviously we will see as time goes one.
At this sort of price points it is no big deal if I end up not liking and want to try something else from the excellent suggestions here.
Tbh with my Sanyo receiver with tone controls I can boost the treble a little if needed, I could not really fix the perceived harshness of the Silver’s though when pushed.
I have already found out the Haydn are more critical of placement. I had a little too much bass boom and just moving the LH speaker 3 inch forward and 4 inch further apart and narrowing the toe in cured that entirely.
Oh and they absolutely need the port bungs in place in my application and location.
I certainly am a lot more aware of top shelf monitors around this price now so that is a very good thing indeed!