I own the ARV 106s. I don't pay much attention to Vishnu despite their presence here in NS, but my feeling is they are two very different skis apart from being 106 waisted twin tips with progressive mount points. But I'll give you my thoughts on the ARVs:
The ARV 106s are heavy and stiff, and that's not an exaggeration by any means. Maybe not hard charging-directional ski stiff, but for freestyle skis they definitely are. If you don't believe me, just read [tag=105085]@Twig[/tag] 's roofbox review. I think they'd be a great option for you at your height and weight for Whistler: I skied 5 days at Whistler last season with my 188s and I'm 5'11" 190lbs and I thought they were great for ripping all over Whis. I feel like the 188 could also work at your height and weight for your local hill since it seems you prefer more of an aggressive approach. I definitely would stay away from the 180 length, as their true length probably comes out to like 178 or less.
Full disclosure, I'm selling my pair of ARVs here in the buy sell section (plugplugplug) only because I don't plan on skiing that aggressive anymore as I'll be skiing with my kids soon.