I've got a six burner Viking - worked fine for a 3 years and since then has been a headache. service and parts are out-of-this-world. each of the six grates has four little rubber feet. well, they 'wear out' - get sqooshed with time - whatever. no problem thought I - I'll just get some new ones. packet of four from the kitchen joint: $16
that's $4 each for a little rubber doohickey smaller than a pencil eraser; times 24 every 18-24 months. how outrageous is the price? I found a company online that makes them, called them up, explained what I needed. "How many?" was the question. "Oh, hold on, we can send you a fifty count package as a free sample product." that's how much they "cost" - the kind&generous manufacturer even paid the postage on the samples.
I picked the Viking because I wanted a sealed burner top, I only had two choices at that time. I would not pick Viking again.
nextly, on the grilling idea - you're gonna need a mega-sized exhausting hood to do any serious grilling indoors - physical size to cover the cooktop/grill area plus 2000+ cfm exhausting flow. 2000 cfm (cubic feet per minute) means that hood, in a 3500 sq ft house, 8 foot ceilings, will suck out the entire house volume of air every 14 minutes. if you live in the tropics, not a big deal. if you're heating that house air, gets costly and may require an upgrade to your heating (and/or air conditioning) systems - to keep up with it.
grilling shrimp on a skewer is not an issue. grilling 3-4 Delmonico steaks (ie the tasty one with fat...) will generate a lot of 'smoke.' it also coats everything in the kitchen with a fine layer of grease - whether you run the exhausting hood (low-medium-high) or not.
I'm not trying to dissuade you - it's your choice - but just be aware indoor grilling has its "costs" & issues.
as to 'reconditioned' retro-appliances - proceed with caution. one can 'recondition' an old gadget just taking it all apart, wire brushing off all the corrosion, lubing everything up and selling it. a more thorough job replaces all the working guts - valves, burner throats, etc., with new materials. a cleaned up old cook-top has the same parts availability as an uncleaned up one. one with new guts & working parts would be more serviceable - but be sure to get a complete list of those parts/manufacturer/etc because very few service people can walk in the door and recognize every and any make model part ever made for gas cook-tops.