I don't care what type it is, just so long as it's thrilling enough to be a Secret Weapon but not to scary so it can attract families, I think that's what Towers needs at the moment. Make it like Thirteen but good. And don't market it as "TaLLESt FAsTEsT ScARIEsT RoLLEr CoASTER EVAHHHHH", make it tall and fast but no inversions and not too forceful. And for world firsts, how about "World's First _____ Coaster In A Valley"