If you live in an area which has locally owned repair shops, who work on large
appliances, I would start there, Maybe the place you buy your appliances? Otherwise, if you Google "best rated double gas ranges" it should come up with a few lists. Or follow Ina Garten and order the range she got from France recently. Very pricey however, but totally custom made and the unit will last a lifetime for you and then you pass it on down to the kids.
Aside from that, I have loved my Dacor double ovens and six burner cooktop.. They have been in use for 17 years now with little repairs, and are great.