Ski Suggestions

I'm 5'9 135 lb male. Every single ski shop I've talked to has given me a different answer.  What typical length should I be looking for in my skis? I currently own a pair of 168s and 175s but prefer the 168s by far. Is that closer to the right length for my body type? I'm keeping my 168s as a beater ski, but am planning on selling my 175s.  The 175s are a park ski, but I ski resorts with little to no park - but they have some nice natural features.  Is there any ski that is more of an all mountain freestyle ski (Not sure if I said that correctly)?  Something that performs well on runs with natural jumps. No moguls, and powder has been rare as a general rule where I ski lately :(

So, basically what I'm asking is what ski or skis (I like options) would be the best for hitting jumps off natural features with minimal jibs (no rails at my resorts).  Not a powder ski, something thinner but still light.

Thanks.