Another possibility: Blizzard Rustler 11. Nice ski. Good float, play, and crud handling, 180, 188, 192(?). (All three nice when I tried 'em.)
Your comparison of the 115 and 118 is what I've heard too. (Only demoed the 115 - liked it in crud, not its float.)
The Wildcat is supposed to be lighter than the Bibby Pros, so maybe a bit different feeling and capabilities also, dunno.
With the Bibbys, both are fun. But unless you are large, 184. Your size and strength may be a factor: if a bigger guy, then you might like both, and the longer wouldn't be even slightly too much.
For myself, a lighter weight, older guy, if I had to choose just one, I'd choose the 184, waist 116. It's just better for my size, and it still charges and nails crud, when asked to, while being also more playful. Both like variations on fall line skiing.
I don't regret having the 191 also: it's enough different, and it's got more float and fore-aft stability, while still being forgiving and playful, just as the Blister folks said.
(I skied the 191s, waist 118, in powder both today, Friday, and this past Monday. Fun: more stable, very relaxing that way, but slightly big - not sure if too big. Am playing with the mount position on it, with Schizo bindings - so far seem to like +.5 cm best, but 0 and +1 cm were nice too, with +1 being more playful.)