Those 2 are beautiful! The 100% stock Z is my fave. The red one has been repainted,so I would avoid that one. I would try to find one with a good factory paint job still intact.
My #1 choice of a Z would be a TT of course,but in all honestly I would want a 2+2 auto (that back seat would come in very handy for luggage,groceries,etc. The back seats come in handy on a daily driver.