Jaleo, for sure. The olive mix provided at the table is reasomn alone to visit. Most of my favorites are vegetarian:
tortilla espanol ,patatas bravas, spinach with raisins, grilled asparagus, eggplant flan, trumpet mushrooms, apples and manchego. But there's some gold to be found on the protien side with cod fritters, mini-sausages, stuffed chicken.
If you do go to Taberna del Alabardero, only go for Happy Hour, when the tapas are half price. Pate de conejo, patatas bravas, and anchovies are the ones I recommend.
I second (third?) the Taberna del Alabadero bar during happy hour. It's a good value, and very authentically Spanish feeling. It's a lot like being in one of those lovely tapas places in Barcelona, except no one is smoking at the bar. The staff is friendly and helpful, and the crowd is international.
Jaleo is quite good, and I've had some stand-out dishes there. I fondly recall a beet salad. Their tortilla espanol is delicious. But it can be very hectic and often full of large parties with kids. It doesn't invite lingering to the same extent that Taberna del Alabardero does.
I don't know about tapas near College Park but I think the best tapas in DC is at Taberna del Alberdero...it's even better during their weekly happy hour special because then you get usually really expensive food on the cheap.
Of course there is also Jaleo which a lot of people like. I think Jaleo is good, but Taberna is better.