Walk in the grocery store side of the new-ish Super Target on Colonial in the new-ish SoDo development and find THE best value for lunch: great salads from $4 to $4.50. Cheap, filling and high-quality. The next best thing is Jasons Deli, which is opening soon at the SoDo. For around $7 you get an all-you-can-eat salad bar with free ice cream and (if you sneak it) coffee.
The Target is hideous. Ignore it. The salads are worth it.
SoDo will be a fun, walkable shopping plaza in the vein of Lincoln Road and The Grove, but less touristy and flashy.