I'm a fan of Oishii! It's quick and easy on the wallet, great for a quick dinner or lunch. The place itself is small and it looks like there's nowhere to sit but they have a whole upstairs area with tables and cushion-seat counter.
I got a bulgogi bento box here that came with a miso soup and sides of kimchi, pickled radish and glass noodles - all for under $10! We also got a spicy tuna roll, it still wasn't spicy and the rice wasn't very packed but for being $4 or so, I wasn't complaining.