The general concensus around Ranger is either go full strength or go full VIT. Personally I'd say the VIT build makes more sense after ML20 when you can compensate by adding +50 / +80 STR runes to your gear. Otherwise you're trying to compensate for a lack of defence with blue seed runes (hoping for high VIT), hones, and Radiant VIT runes (I think they can go to +9 but the most I've ever seen was a +8).
At master level basically skills wise just max arrow shower for instant cast and max multishot. I like having camo & camo mastery maxed as well for moving through dungeons quickly, oh and wind walk. Other than that Impact arrow seems to be the single target attack of choice.
Cards I'd say Mummy cards (36 STR 29 VIT), unless you can get your hands on Red Fang Leader cards (38 STR 31 VIT) or some of the Jawaii Wonderland Cards.
I have two rangers in game currently (with a third on stand by list) so I've experimented with builds quite a bit, if you see me in game feel free to PM.