If you are ever in the Wheaton area at breakfast time, try Nick's (corner of Viers Mill Rd. and University Blvd.). It's small, with a counter and a handful of tables, and the "decor" consists of a few posters of Greece, but the food is good and inexpensive. It is run by a few generations of a friendly Greek family, which you would discern from their menu right away (spinach and feta omelette and a few breakfast sandwiches on pita).
Their breakfast meats are wonderful, especially the ham, which they cut off the whole joint per order and heat up in a pan. They have a great selection of omelettes, too. And, their hash browns are outstanding - the potatoes are cooked with some seasonings and then fried and they have SO much flavor (I'm a hash brown freak and these are tops, promise).
They are also open for lunch, but I haven't tried it except for weekend breakfast. It's definitely worth a stop.