sam1234
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5035
How about a nice 5035? A mint example with box and papers can usually be had within your price range, and is available in yellow, rose, or white gold.
Patek was the first to introduce the annual calender and it was immediately well received as a "useful" complication. Now long since discontinued, the 5035 represents a relative bargain for a Patek complication.
Great reference, great value, 100% Patek. Future value? Who knows, but its a classic that will look great on your wrist while you wait to find out!