Want to try separates, what to expect.

Inna, Which world are you living in? Auditioning not kosher? He might well buy or trade something in later. As long as you are up front with a dealer and not there on a busy day, they should be accommodating. Or am I thinking of a world long since past?

Mizike, I have spent the last 12 months learning about today's audio
world. I had a surround setup for 20 years I was tired of. Last week
I saw a very lightly used tube amp by Cary I bought for $2,200.
It has 60 wpc triode and 120 ultra linear. 
I had been using a vintage Scott tube receiver rebuilt by an expert.

The difference in sound is amazing. Your Modwright is probably a hell of a lot better than what I had. The chase is exciting!! Have fun!!

"By moderately priced I talking about used prices and a budget of around $12,000. Based on the cost of some of the very high end equipment, that seems moderate to me. I do sometimes think it may be hard to improve much on the Modwright with that level of investment."

Oh I beg to differ.  As good as your $5000 integrated is, there are limitations.  Below you'll find listings for a $4500 preamp and $7500 amp that meet your $12k budget, and if bought new you'd be out over $26,000.  Buy them, and if they don't soundly beat your integrated on virtually every level I'll come over and eat them with some fava beans and a nice chianti. 

https://www.usaudiomart.com/details/649453502-allnic-l3000-mkii-stereo-tube-pre-amplifier/

https://www.audiogon.com/listings/lis949db-pass-labs-xa-100-5-solid-state?refsource=hifishark

You live in the world of 17 posts. Where I live is none of your concern.