Zen is one of my favorite budget places to eat in Pittsburgh.
The sushi portions are great for the price, and the staff is friendly.
I was having a bad day recently, and they took time to make my sushi order especially fantastic.
I know it's not the fanciest establishment, but I couldn't recommend it higher. Bring your friends this sushi, tell them it was $12 per roll instead of $6, and they will believe you.