We have lived in the Wheaton area for about 10 years and have come to love El Pollo Rico. I like to affectionately call it "crack chicken" because it is so addicting. You have your choice of 1/4, 1/2, and whole chicken, along with sides. Highly recommend rice and beans and their tortillas. You MUST get the yellow sauce. I don't know what the yellow sauce is, but ask for extras because they never give you enough. (Promise me, you will get the yellow sauce?)
This place is popular, so give yourself some patience. You'll get through the line in no time though.