Thermador Gas Cooktop 30" Stainless Steel SGSP305TS [1]
I was not planning to spend that much, but I'm glad I did. I was replacing an obsolete 32 inch cooktop, which had a roughly 31.5 inch cutout in the counter. I found out that this 30 inch cooktop actually covers about 31 inches of counter, more than any of the others that I saw. I epoxied a stainless steel shim to narrow the opening on the far side of the cooktop. It looks good and works well.
I chose this model in particular since it has a high power center burner. With a lightweight steel wok you can make great stir fry with good temperature control.