My in-laws have good luck with their Vent-a-Hood brand hood, which has switches rather than buttons, that don't get gummed up. You definitely want a hood and not a combo microwave one, and other than that I would look for something with as much CFM as you can afford, and that extend to the edge of the range. I've been stuck with a combo microwave one, and it doesn't extract much air when using the front burners. Note that if I were you, I'd buy whatever was the best I could find on Craigslist, or you could also make your own with a powerful fan and some plywood, if your cabinetry is painted, or sheet metal bent over a 1/4" ply framed scoop.