I tried the Tiger Eye Roll at Kaizen, and it's something I've never seen or eaten before. Pieces of tuna, yellowtail, salmon, a stick of cucumber all wrapped in seaweed and squid(!) with an outer breading. The roll didn't have rice, so you'll be good if avoiding carbs...
Also had the chicken katsu bowl, which was nice and crispy.
Vegas has really good sushi, and the sushi chefs at this restaurant were masters at the craft.