Any station that does not broadcast IBOC and uses its upto 10KHZ frequency responce is gonna sound decent on a good anolog AM Radio.
Maduci AMX-2000 being used here.
WVLG I think sounds good.
WNTP sounds good.(I'm talking audio quolety, not the compression of the signal. As far as who's not so compressed, I've not heard any on AM.
WBCB is good as well.