The better grills can be purchased at those BBQ specialty stores like Barbeques Galore. We bought a Barbeques Galore Captain Cook model 12 years ago and it still works great. Certainly not even close to their top model but excellent nonetheless. They are a little more pricey than going and getting a grill from Lowe's but their stuff will last longer and when things wear out and need replacing, you can always get them right again because they have all the parts available.
One thing to consider if you have natural gas is to have a gas jet installed outside. We did this on a new construction home previously and it is the greatest thing ever to not have to worry about ever running out of gas in the middle of a cookout. Any decent gas grill can be fitted with a simple conversion kit to go from propane to regular natural gas. You switch out the flex line and the Venturi nuts (NG requires larger lumen "holes") and that is that.
Now for a real opinion and it is just my $0.02, but when I do steaks, I only do them on charcoal. It's a taste thing. I've tried adding wood chips and all that jazz for the gas grill and it just isn't as good as the flavor you get with charcoal no matter what anyone says. For that reason, I still have an old Weber kettle out back for steaks. If I remember, whenever I go out to the ranch, I try to bring back some mesquite wood. Lighting that stuff up in the Weber and letting it burn down into coal is just the BEST for steaks.
Craig