You have many many choices and the fishing is pretty much excellent anywhere. Are you bringing your own boats? How big of a lake would you tolerate?
Not sure how cushy is too cushy for your group, but Reserve Beauchene is pretty much the epitome of excellent trout fishing, and 5+ star accomodations. The main lake is great for lakers, and they have tons of backlakes loaded with specks, splake, and lakers (some stocked, and some natural).
Cabonga reservoir is an amazing lake trout fishery, and apparently a pretty beautiful and gigantic piece of water, don't know any particular outfitters but I'm sure there are some very nice facilities on the lake.
There are many ZEC's in the province which operate nice outfitters in areas with lots of small brook and lake trout waterbodies. Go on the main ZEC website, click english and spend a night investigating your options if you're more into the small lake thing.