Either Volcano, The Blast Coaster or Flight of Fear @ Kings Dominion.
Volcano, The Blast Coaster
Expecting it to be "just another roller coaster" as I entered the queue, I wanted to ride it just for another "been there, done that" sort of thing, mainly to increase my coaster count. It honestly looked a bit tame as one of the first impressions. However, I was totally thrilled by the entire experience when I actually rode it, specifically by its quick, 70 mph launch I didn't see coming, as well as those highly situated heartline rolls (I really almost can't stress it enough how awesome I think they are); I found it so cool being up there and "rolling over" with the amazing sight of the aerial view doing the same.
Flight of Fear
Only wanted to ride this for the same reason as Volcano, The Blast Coaster - just for a "been there, done that" and to help increase my coaster count. It seemed to be insignificant at first, looking to be "just a little indoor roller coaster". But after being launched into a near pitch black area, I was astounded by such suspense of its awesome, seemingly insane sensation - being hurled around in this darkness, not knowing what's next and unable to clearly decipher which way is up or down.
Both coasters are currently in my top 10.