I think I would go with a black sashing and the rt 66 fabric as the main border.

Same for me, the second foto, it brings everythign together, and the background on the car strip gives the eye someplace to 'rest'.
What a great quilt you made!

#2 for me

I like #2 also.

Voting black, too.

I like the checkerborad and then the cars.

Me, too!

solid black

Thanks to everyone---you reinforced my thinking, so off I went to Walmart tonight to pickup some black fabric. Much to my surprise, everything is on sale at 50% off.. Good for me I bought 10 pieces of fabric over 23 yards of fabric and only paid $23.00. Unfortunately, they are like so many Walmart stores and closing down their fabric department. Boohoo. Oh well there's still Joann and Hancock..
Thanks again for all your input.

I guess I got in on this discussion a little too late but here is my idea anyway. I like the black and white check, it goes with the car theme. How about a 2" black border, then add one row of the black and white checks, then another 2" black border. It calms down the "busy" but still keeps the checkered flag!