Definitely Gonzo, his ballbashing was orgasmic
, that's why I voted "other" but I realized you didn't put him because he was retired.
Then I would vote for a semi-retired player : James Blake, semi-orgasmic comparing to Gonzo.
Among more active ones Del Potro or Golubev.
I don't think Cilic is a ballbasher but Gulbis definitely should be in the list, maybe the purest ballbasher of all.
Berdych Del Potro partly.