I'm no expert in grilling, but we recently changed from a regular ole propane grill to an indirect heat propane grill. The indirect seems to cook quicker, but the real benefit was the eveness of the cook. We do not have to worry about flames up either, and if we had the urge, we could steam crab/lobster on it as well. I wish I could remember the brand though... We bought one that you had to put together yourself, handmade blahblah, but I think it was fairly decent in price. I'll look around for some info.
Those indirect cookers are basically just outdoor ovens. When you're grilling, you want high heat and flames with stuff like burgers and steaks. That's why charcoal grills cook so well. They burn so hot.