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


So I really do not know where to start with bookshelf speakers as not been in the market for any for ever it seems.
This is for a second system where a pair of Monitor Audio Silver 3i are currently doing duty.
Room is largish and open but ultimate sq is not the aim as it is occasional use only, but when I do fire this rig up I usually like to play fairly loud.
Sources are many, fm radio, cassette tape, vinyl and streaming.
I have plenty of horses to feed them so even inefficient models can be considered.
Prefer to buy used as big savings to be had obviously and already broken in.
So suggestions around a maximum price break of $500 used.
Thank you in advance.
128x128uberwaltz
Wharfedale 10.1 or 225 models are pretty decent and much better than their price might suggest.
I had the Diamond 225 in use for the past 3+ weeks. The sound was quite good and I could listen for hours to their comfortable sound. However, I wanted something a little more when it came to the top end detail and opted for the Elac B6.2 speakers instead for $170 - locally, and still in the box.  I've read about some crossover upgrades and would gladly spend $100 in components to slightly enhance the sound.

I have a good friend who owns a pair of  Roger's Studio 1a that are in immaculate condition placed on 14" stands I believe, not positive on that but they  sound pretty fantastic in his room. Still impressive after all these years. A larger bookshelf than may be desired though. Finding a pair of them in that condition would be challenging. Another classic sounding bookshelf would be a pair of Snell type Jll's.   It will come down I think on the type of Music you fancy most. 
Any PARADIGM STUDIO 20 pair in good shape would be awesome. I have a pair of Klipsch RP-160M speakers ans do not find them too bright for my Classical listening. The Paradigms are a step up.
They are normally (Paradigms) on eBay for a descnt price. I ahd a pair of series 1s for years.
Well after living with the Haydn's for a few weeks I am happy in my choice.

The bass and mids have a lot more texture, timbre and solidity compared to the old MA speakers.

The treble is a little softer in delivery, not rolled off but just not as harsh or brittle as the MA were.

Now I am sure there were plenty of other competent speakers amongst the suggestion list and not saying these are the best but.....

As I was able to view and pick up local and pay cash it worked out very well for me.