Well I would start with the first one. It's only $5000 over the second, and is #'s matching which will help you if you sell it in the future. I like the complete owner history too. Is there any other documentation for it? The third one may be nice but since it's at a dealer then you know they probably paid the same or less than the asking price of the first car. It's probably also in similar shape or worse shape than the first one is. A dealer needs to make a profit to stay in business so keep that in mind.
A power top is not a big deal. I have a manual top and can put it down in 30 seconds by myself. If you would buy a bigger convertible than you may want a power top, but a Camaro is small enough that a manual top isn't needed.
'69 RS SS 396 375hp L78 Convertible, M22, 3.31 posi, deluxe interior, gauges, rosewood wheel, AM-FM, fold down seat, tilt wheel, Torque Thrust Wheels, console mounted 8 track player, chambered exhaust, locking gas cap
COMING SOON Corvette tripower, small body HEI, and maybe "842" aluminum heads