Consumer Reports top 6
All depends on your budget and peripherals you want but I've highlighted CR's Top picks in bold. I personally think Weber has a good name but you can get more bang for your buck with other brands.
1. Vermont Castings Signature Series VCS300SSP - 85/100 Pts. $900.00
2. Vermont Castings Signature Series VCS322SSP - 85/100 Pts. $1,050.00
3. Char-Broil Red 463250511 (Home Depot) - 84/100 Pts. $400.00
4. Char-Broil Gourmet TRU-Infrared 463250512 (Home Depot) - 84/100 Pts. $400.00
5. Kenmore 16142 - 80/100 Pts. $350.00
6. Weber Genesis E-330 - 80/100 - $800.00
Weber's are the best looking. You can choose between either porcelain/ceramic grills or steel, both have their own pluses and negatives. Porcelain heats evenly but you won't get the grill marks that you would get using a steel grill. You also have to be careful to not scratch the porcelain, once you do it'll start chipping and you'll have to replace them, which are pretty expensive. Steel doesn't chip and they're way cheaper to replace. I prefer steel.
My BBQ came with coated cast iron grills. They're 5 years old and are still like new.
Where is the good prices on natural gas?
Something to think about when choosing between LP and NG.
Propane is hotter. It's one of the components of most natural gases and byproduct of refinement of crude petroleum. Propane heat output is about 2,500 BTU per cubic foot. Methane in its turn is the main constituent of natural gas and its heat output is less than half of propane's - 1,012 BTU per cubic foot.
So if you like to sear your steaks, LP is the way to go.