Santacafe has a nice interior, and their food is decent, but not the best in town.
Cafe Pasqual's is probably too small for a group of your size.
I would recommend the restaurant at the Inn of the Anasazi, The Shed (more casual), or La Casa Sena (which has a gorgeous outdoor seating area).
I would recommend Harry's Roadhouse. I love their turkey enchiladas, and their prices are very reasonable. It can get crowded, but with two people you can usually get seated really fast. Los Portillos, the Shed and La Choza are also really good. I drive by Adelita's all the time, but have never tried it. It appears similar in caliber to Los Portillos from the outside.
I agree that you should skip Tomasita's!
Not sure if your visit has come and gone, but here are some suggestions: