My absolute favorite thing to order at Rubio's is their Cheese Enchilada Plate. It is at a cheap $4.99 and you get 2 cheese enchiladas, beans and rice, and chips. I always walk out of Rubio's with a full stomach. There is a lot to choose from on their menu and the one thing you'll notice is that their prices are decent. Sign up for their email and you'll get a free coupon to print out for a free taco! They do have kids meals, so make sure you bring along the little ones too.
Rubio's website http://www.rubios.com/ is here.