Tomo has become my mainstay for sushi near Columbia. The prices are right - this is, after all, a college town. The sushi isn't the greatest in the city, but it is good for the price - no complaints. The restaurant is a good size, with average decor and a comfortable feel. The staff is always pleasant and welcoming.
The delivery service is fantastic. They will keep your credit card on file for simple ordering. Delivery is swift and accurate and the drivers are nice.
The menu is extensive and what you'd expect. Good lunch specials.