Clarke This is a Wolf outdoor gas grill. They come in both built-in and freestanding cart versions. The photo shows a built-in version and both a natural gas and LP version are available for running a line as you described. When ordering your grill you will need to specify which gas supply you will need. If you are in New England, we can give you a "test drive" at Clarke. Just call our toll-free number (800-842-5275 x 206) and identify yourself as someone who found this on Houzz and we'll give you a private demonstration. Good luck with the house!

amymaguire Thanks! I'd love a private demo- but it might only be worth the time if it's something we could incorporate into the house budget- any ballpark- can you Accomplish something like this for 4k? 8k? I just have no idea what is reasonable to expect. Thanks again for your response- very nice!

Clarke Space is 14 ft. x 13 1Ž2 ft.
Counter that holds the grill is 34’ deep and 10 1Ž2 ft long
Counter on the right is 26” deep 14 ft. long
Counter on the left is 29” deep and 4 ft long

Grills are available in 30”, 36”, 42”, and 54”. Side burner is available in 13”

Space required would be based on how much adjacent counter space homeowner would like to have for prep and serving.

Other accessory pieces that may be included in a design include:
A single stainless steel door 18” wide.
Double doors available in 30”. 36’, 42” and 54” widths.
Stainless steel drawer units available 13” wide (2 drawers), 13” wide (3 drawers) or 30” wide (door and 2 drawers)
Stainless steel single drawer 30” wide

motherbear Three words.....Big Green Egg

COASTROAD Hearth & Patio There is a serious debate about wood (charcoal) vs. gas, and everyone who is serious about grilling has a favorite (as evidenced by motherbear's reply above). Since this is a home design website, I assume you're talking about a built-in grill, as shown above.
What is "best" is determined by: what you will be cooking, how often you plan to use it, how many people do you plan to cook for, where it will go, how much space do you have, and how much money you have to spend. There isn't a single answer to all of those concerns.
To give props to motherbear, in some cases, the Big Green Egg is the best, but not always.
If you spend a little time on grill blogs, you'll find out what a great big, crazy world it is out there, and probably end up a little overwhelmed.
Figure out what you want to cook and what you want it to look like, and take that information to someone who likes to grill and who has built a lot of outdoor kitchens. They'll be able to help you out.