I suppose my real concern is if going from $1k to $3-$5k is a reasonable step up for someone with not a lot of experience in the hobby.
Absolutely! That’s a very big step up in potential sound quality as you’re still far from the point of diminishing marginal returns. Big question — are you looking for new or used? Also, what are you using for a music source — what streamer, turntable, DAC, transport, CD player? Last, and most important, what improvements would you like to achieve (what would you like to be better) and what sound characteristics are most important to you? I can’t stress enough how important this last piece of info is. Thanks for all the good info BTW — very helpful.