Prospect Heights has plenty of good sushi, but Ki Sushi is the rare spot with first-rate fish and enough space for big groups. Their dining room on Flatbush Ave (they also have one in Boerum Hill) is dark and moody enough for a date, but it also has a long sushi bar and tables for up to 10 people. The sleek metal and stone vases of fresh cherry blossoms make this place feel like a monastery reimagined for people with money, but you can get a sushi set for $31, and portions are generous. Bring a group before a show at Barclays and order a flashy appetizer like the salmon tartare topped with black tobiko and gold flakes.