A perpetual calendar from UN is a great choice, indeed, BUT I would rather consider a Freak or a Sonata.
The Freak is a really special watch, the Blue Phantom is sublime, really.
The Sonata is a pure piece of Poetry.
To know which of these one you'd choose, my advice would be to go to an U.N AD and to try them...
Let us know!
Best,
Nicolas

CMarcus of course, summed it all up perfectly. i consider myself extremely fortunate and privileged to own a Perpetual and a Freak. if only i could get the Sonata as well. it would be a UN Trilogy that i understood as the real trilogy is a bit too complicated for me.
good luck with your purchase. i'm sure you will make the best choice for your circumstances.
best
Graham