There are a couple of considerations when thinking about installing a downdraft range in your kitchen. The actual brands don't matter much, although you would be wise to stick with domestic ones like JennAir, etc, not some Euro brand that you can never get parts for later. Is your floor structure such that you can easliy add a 15-30 foot exhaust run under the house?
The other consideration is the actual performance of a downdraft versus a regular cooktop. A downdraft will not have the capability of removing large amounts of smoke or steam from a tall pot as effectively as one that has a vent hood over it . The downdraft will at least remove smoke from a griddle surface if you do mostly frying, etc. If you do lots of cooking with big utensils, you should consider adding a pop-up downdraft exhaust right behind the range, so that it pops up and catches all the steam from the taller pots as well as the flat skillets. Without this, you will not have the advantage over the smoke and steam that you would otherwise.