I used to get WSPA pretty regularly in Sevier County, but haven't in a while. I work in Sevier County, so my daytime DX happens there during lunch a lot. Now even there is filling up with translators and LPFMs. The Newport AM just grabbed 97.9. I can remember getting WSIX pretty regularly, as well as 99.7. 95.5 is still open and I can sometimes get WSM-FM, as well as Prestonsburg, KY and sometime the WSB simulcast. I forgot to mention Kiss Country from the Asheville market which sometimes is stronger than 100.3 in Sevierville.
Nashville stations do have good signals throughout much of the state. I remember being in a Gatlinburg high rise in 2005 and getting almost all of the stations from there. I even got 97.1 (then an oldies station).
WSPA 98.9 is probably the most powerful FM from the Upstate of SC. You can hear it over the mountains into TN, east of Charlotte (I've heard it as far as Salisbury, NC), just NE of Athens, GA, and south of Columbia. In the Charleston area, it comes in frequently over our ESPN on the same frequency.