Good, warm, musical, under $500 used monitor

I've been searching for the perfect inexpensive monitor, and have way too many options. You know, I keep thinking I have it nailed down, then I'll find something I might like better. I like a warm, musical tone, but my system is bright, and I have a small room. I'd prefer an engaging sound over hearing every last detail. Had been considering a used Sonus Faber Concertino, but it is above my $$ range. That is the sort of tone I'm going for, though. I'll be getting a sub as well, so I'm not concerned about the bottom octave (although which sub will depend on which speakers, of course).

I'll consider new, as long as it's in the price range.

What's the perfect speaker? Helppppp!!!!!!