Many cooktops available: GEmonogram, Viking, Dacor, THermador, Wolf, Sears Kenmore Pro, and on it goes. ALso Rangetops available from many of these companies. Downdraft ventilation need not be built in to your cooktop if you can make counter modifications.
Pro style cooktops have burners with 15,000-18,000 btu power. A restaurant range will be 25,000 btu, and a restaurant wok burner is 125,000 btu ... power you can't get at home unless you use your turkey fryer outdoor unit inside (not recommended.)
All these companies have conversion for LP gas.
Other options include Induction burners if you have cookware that is magnetic.
GO out and visit dealers show rooms etc. Get catalogues, go to web sites etc MAke an informed decision of what you think best fits your kitchen and your cooking style.