Avoid the cheap crap.
Look for sales on Weber Genesis type 3 burner grills. (I.ve had one for
12 years).
Better yet, Weber Smokey Mountain grill. I got one recently and only
use the Genesis to boil water now.
I tried many years to make smoke flavored BBQ on a gas grill and never
got it right. On the first try with the Smokey Mountain, it was pretty
decent.