I would recommend the weber. I know that it cost more than 300 but this grill will last you 10 years or more. Any other grill you get will need replacing within 3-5 years.
Take a look at the weber forums at virtualweberbullet. They have a gas grill section. If I had found that site I would have gone straight to the charcoal and skipped my gas grill purchase.
Try searching in Craigs list. I always see weber gas grills going for cheap.
I currently own a Weber WSM smoker, a One Touch Gold 22 and a Thermos/Charbroil gasser.