FF-
I got a "Member's Mark" grill at Sam's Club about eight years ago. It pretty much matches the big Weber, but at half the price. It's all-stainless, 3 17,000btu burners, rotiss with 12K btu infra-red burner, and a 12k side burner.
The maker, Grand Hall (Chinese, naturally) has a very good reputation for quality and service. Take a look at these websites.
Member's Mark Gas Grill - Part 2 (continued discussion) - Cooking Outdoors Forum - GardenWeb GrandHall
I believe Costco has a very similar if not identical unit from Grand Hall; I think it's still about $600.
Based on my experience, I'd say it's worth a look.
Mike