All Clad round grill pan
I have this and it is completely worth the cost. I wanted a grill pan after seeing so many TV chefs cooking with it and getting those oh so desired grill marks. I chose the All Clad only because of a sale that I couldn't pass up, but I am not regretting it for a second! I have cooked in it steaks, grilled chicken, pork chops, and vegetables. It cleans up beautifully as it is non stick, and my food is gorgeous! I think that the reason that the food tastes better from this pan is because it looks better, and the visual is part of the taste experience.
One major benefit of using a grill pan is appearance -- the grill marks. The All-Clad grill pans I'm acquainted with are non-stick. Good grill marks are supplied by fairly high heat. there's a general consensus these days that non-stick should not be heated to a high temperature.
For grill marks, cast iron will do you well. Heat it as high as you want.