If I were buying a range and had the budget, high quality open burners would be close to the top of my list. I like a lot of power from a range, and BTU figures only tell part of the story. Even the best sealed burner designs send much of the heat energy to the edges of the pan and way beyond. Good open burners send the fire straight up. More even heating, and more of the energy gets to the food. Look up videos for Bluestar's burners; you'll get the idea.
I'd also look for a very powerful, well designed broiler, like the infra red top broilers on Wolf and Bluestar.
A friend of mine has a 48" Wolf (from before the acquisition by Sub Zero) that has both a griddle and "char broiler" grill on top. When the char broiler broke down, an authorized repair guy spent the afternoon scraping burnt-on gunk from its bowels. My friend asked how to keep it from happening again. Repair guy said, "Sir, you shouldn't grill inside the house."
So this is a feature I'd pass on.
