^Doom? MANY, many times (single-rider line, LOL). Overall, I'll take IB's or Keansburg's. BAM! :)
Wild Adventures in the old days used to CRANK theirs up to high. Since they got Cheetah, it's been run more along the lines of HW's Liberty Launch (i.e., set on TAME mode).
Bigger isn't always better. :) As far as drop towers I like them as tall as they can build them.