I will second the recommendation of the Weber. I have a Genesis Silver B ($550 for me, but now $450 is the going price) that is now 4-5 years old. It continues to work flawlessly. I've never had to replace a single part on it, and we use it year round. Since we're in MA, that means I usually have to shovel the snow off the deck to get at the grill.
I had owned several other lower priced gas grills before, like those by Char-broil. None of them every had an igniter that worked more than a year, and the Char-broils I had all needed new burners every 2-3 years (if you cleaned them, all you had was rust on the inside).
Now, Char-broil and others make more expensive grills, but I won't give them another chance at my money.
I will note that Weber has made some changes in the Genesis Silver B since I got mine, like the plastic handle. I don't know if I like them. I will note that mine has plastic-wood for shelves and such.
Also,
FWIW, I generally didn't like the design of the Silver A ($350), and I didn't think the Genesis Gold was worth the extra money (I don't need a side burner).