I'm with Graham, I had a 71 for a couple of years, but sold it as I longed for flat rear arches and wide 5 wheels... so I've voted for 69 as that's what I have now, but really, anything 67-70 for me..
Lets be clear, this isn't a serious thread, and my comments are just personal opinion, I like ALL early bays. And splits. And Lates.