175-190 depending on how much ice cream i've been gorging
solid hacker (will pick my way down just about anything, but may lack grace and style on some of it)
my planks range from 175, 177, 180, 186 and will probably add a 181, 185, and maybe 188 to the mix, depending on whether or not I get my gear jones in check.
as stated multiple times above, it really depends on the ski. the example I always use is that I tried the 175 and 186 M:EX. the difference between the two sizes was insane. the 175 was nimble, quick, and had decent float performance as an AM ski. The 185, at least for me, was clunky and cumbersome, much harder to move around and a lot less frisky.
my 177 Karmas and Mantras feel short if I'm just blazing down groomers, but they feel just right in tight spots and chutes and moguls (i.e. I'd love a back-up pair of each in the next size up). My 180's feel a little long, but then the ski is stiff and somewhat burly compared to the rest of my quiver. the 186's look short, but then that could be the effect of the 125 waist in comparison to the length.
itching to try something in a +180 length to see if they are in fact "too long".
at any rate, if you're having length issues, why not demo a few pairs of skis in different lengths this season? i've pretty much determined that my "comfort" zone is between 175 and 180 depending on the ski. though over the summer and after first turns this season, I'm re-thinking length and will demo a few different skis this season in longer lengths to suss things out.