If you are going to get your own grill out...
Edelweiss: 3119 SE 12th, off Powell, just over the Ross Island Bridge (they also cook some on site, small deli seating area)
Gartner's: 7450 N.E. Killingsworth, close to I-205 (in the summer they have a grill out front during lunch time)
Bavarian Sausage Deli: 8705 SW Locust St, near Washington Square Mall, off 217 (they have lunch specials, every German cut of meat imaginable)