I am a novice as well. I also inherited a system. And I like it.
At its core is a Proceed HPA2 (Levinson) amp (250 wpc) which is basically like two monoblocks in one (100 pound) case and an Audio Research LS-16 tube pre-amp. These drive a set of notoriously inefficient speakers....very very well. The original owner was very savvy as these two seem to pair well and also pair well with the speakers (Aerial Acoustics).
You don’t see either of these for sale used very often but you do see similar models of each. I’m guessing you could get both in good condition for well under $8000 and probably under $4000.
That is the full extent of the advice I can offer.
Edit: There is an HPA2 on eBay for $1770 (although the picture shows a BPA3) and an AR LS-27 for $3400. Bingo!