Another vote for a Weber Q. I have an earlier model, a Q120 I think. It folds up, though I keep it outside under a cover, and it's on the Weber folding cart...so it looks and acts like a rolling grill, but I can lift it right up off the cart and put it in the back of the car or truck and go to the game with it, picnic, etc. I use it with both the small propane canisters and also the larger cylinders with a longer hose. It just SIPS fuel -- it's small enough inside that you don't burn a massive amount of fuel just to cook two burgers. Material quality is excellent. I've had mine for going on 7 or 8 years now I think (it's been a long time), and the burner still looks excellent (no rusting or pitting to speak of) and the enamel cast iron grate is still in excellent condition. The main body of the grill is aluminum, so it won't rust. It channels all drippings down to a central funnel point, into a small tray.
This replaced a cheap Char Broil that rusted out after about 3 years. The burners rusted, the heat tents rusted, the floor rusted. When I couldn't find replacement burners for a reasonable price, I bought the Weber Q.