I'm about the Kingsford and Mesquite!
I've never been a fan of gas Grills though I must admit they can be convenient.
When I still had my restuarant open we used gas Grills and I "Charbroiled" up all kinds of tasty treats (whole chickens, Carne Asada, Shrimp, Salmon). So for sure a Gas Grill can cook up some delicious food. If I had to choose one though it would be the Smoker/BBQ.
Here at home in Southern California a Charcoal Grill may be more convenient than some other parts of the states where the climate and temperature are different.
There's something about the smell of kingsford or Mesquite/Hickory. It's part of the ambiance of grilling plus it adds flavor.
Sometimes though when you just want to grill a few small items like a burger for yourself a Gas Grill is handy to have.
If I won the lottery I would get a custom made BBQ/Smoker built. I've seen some of those shows on good eats about the BBQ Contest and some of the equipment these guys have are unbelievable. Smoking and slow cooking creates some awesome grub. Some of those grills have the compartment on the side that you can use to control the temperature.
Thankgod Summer is just around the corner!

Let us know what you decide on...for $689 you better do your research/homework!