Hard to beat the durability of the Weber Genesis gas grills, but I don't really care for their left to right burner design which makes having a cool zone rather difficult, I much prefer front to back burner design when dealing with gas (which isn't often, thankfully).
I would suggest checking if there is a BBQ Galore dealer in your area and seeing if they still carry/manufacture the more modestly priced units. I have one of their old 4-burner Cook-On grills, which was fantastic as a gas grill, I used the heck out of it for years, I would typically burn about 20lb of propane a month until I got tired of food that didn't have any flavor.
I also hear good things about the higher end Brinkmann stuff, but I haven't used them that much to form any real opinion.
The grill guy on about.com actually seems to have some solid reviews and I noticed that he will call a grill out for being junk or poorly designed, unlike some of the other reviewers there.
http://bbq.about.com/od/grills/u/equipment.htm