What amps/preamps/integrateds to use with a particular speaker?

The Signature is still the better of the two speakers, it is larger and it is a bit more expensive, however, the drivers on the Signature are better.

The classic HD are good, the Signatures are even better. In terms of overall performance you have a better top end with the Signatures.

As you have a Heil AMT for both the treble and midrange and cross over to the silk and graphite lower midrange driver in the Signature vs the Heil AMT for the tweeter only crossing over to the midrange in the Classics.

Little puzzled why you wouldn't want the sealed bass of the Sigs?

So you want to get a straight integrated do you need a phono stage?

Dave and Troy
Audio Doctor NJ Legacy Audio dealers

Audiotroy,
I don't like sealed cabinets.  My preference is for a rear-ported design.
I have an external phono preamp and an external DAC.

Hmmm...no responses...
I guess I’ll have to get things started. How about these...?

Electrocompaniet (used)Modwright (used)Odyssey

What's wrong with the forum editor?  My editing (spacing, etc.) is not being taken by the editor.

Sorry for not getting back sooner.
I asked your location because I think you should consider Vandersteen speakers. I think you can do better than the Legacy floorstanders. 
Unfortunately, there are no dealers near you, unless you go to Wisconsin or Missouri.
I also wouldn't strike out a speaker because it doesn't have a certain design. You might be surprised when you hear a new speaker and discover it is using a sealed cabinet.
Other companies to look at (that I enjoy listening to):
Magnepan and Sound Lab- If you would consider eletrostatics.
ProAc.
If at all possible try to audition as many speakers in order to get a feel of what you like.
There are some companies that allow you to audition and send them back, but you have to buy new and pay for return shipping.-But, at least you get an idea of how they sound.

Bob