I wore a mid-size as my daily for years - actually just let another go last autumn - I'm a fan of them, but will say that IMO they do wear slightly smaller than the P.O. in most variations. That said the P.O. is also a fantastic watch.
As far as pre-owned, in this instance you may be better off going through a dealer for assurance of specs (pressure test, etc.) - you'll pay a bit more, but there is less risk in most cases and many dealers, at least the reputable ones, offer very decent warranties on pre-owned pieces that come out of their shop.
Good luck and let us know what you get!
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