"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
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