Watkins Glen - rated as one of the most historic, challenging and entertaining places to race. Plenty of room to host the Runoffs and lots of cool stuff to do off the track.

My suggestion is that it rotates across a few courses in this list - VIR, WG, Mid-Ohio, Road Atlanta, Road America and pick one of the west coast tracks and a soutwest track. Don't know which is the best. Being a Yankee I still have to acknowledge that the west coast gets a unfair deal on the track location for the Runoffs.