How about Smoque Shack? I'm constantly craving their jerk pork. Plus their atmosphere is incredibly casual; perfect for those who don't want something "fancy". I personally find Murray Street nice and casual, but I've had others tell me it was still too "fancy" :P
I'd opt for Murray St followeed by Smoke Shaque, but the pizza at The Grand has been great lately so if your colleague needs a more conservative suggestion that's on the table.
I really like Play's service and wine list, but I've found the food somewhat uninspiring given how much it costs. I want to like Play more than I actually do.
chopper
My favorite spot is Murray Street but I haven't tried many other good places.