There are quite a few sushi places in this area (Annex), and I think Big Sushi continues to be a returning favourite of mine for its environment, food portions, and value. You normally get quite a bit of food for what you pay, so A+ for that. The food (rolls and bentos) are average quality but huge, so it's not like they skimp on quality for quantity.
They also have a few signature rolls that are fun to try. I normally order a bento + roll, but have yet been able to actually finish that.