Glampyre, thanks, nice watch but the broad arrow hand doesn't suit my taste bud... if i were to buy a Pro, 3573.50.00 will be the model apart from the moon phase Pro which i have not seen one physically (in my region), sapphire crytal still my preference ( i know it's not the authentic material), will trade the lack of date for a transparent case back... 
http://www.omegawatches.com/collection/speedmaster/moonwatch/professional/35735000
Cheers!
i take it you're gonna buy new?
else if you want a display back, can also opt for the 3572 instead of 3573, i too went the same way but eventually sold off my 3572...also has a more desirable hesalite rather than sapphire crystal.
some also get irritated at the incorrect wording on the caseback of the 3573 which states "and only" watch on the moon, as we all know it wasnt the only one.
so yea, if you're gonna buy new, just go for 3570...else look at the 3572 also.