My backup rig is a German PD trade-in H&K P7 in a Sparks VM-2...
IMO, the 2 best options currently available in PD trade-ins (for CC anyhow), are the P7 and the P6... Both can still be had for far less than the US-commercial models would have sold for even a couple years ago (i.e. the U.S. commercial Sig 225 and the U.S date-coded P7's).
Both are nice, thin single-stack nines that conceal very well, are quite accurate, and supremely relaible (Although, if you decide to go w/ the Sig P6, make sure it will feed your preferred HP ammo; I think there was a redesigned feed ramp some time around 1988 or something, and a lot of the surplus P6's are dated earlier than 1988)... Some of the P7's out there are literally NIB, never-issued (look for serial #'s in the 77,XXX range) - All P7's I have ever seen and/or shot were dead-nuts reliable with any and everything I stuffed into the magazine...
When it comes to U.S. PD trade-in pistols, most seem to be high-mileage Glocks and Berettas... I'm sure they are quite functional, but hey, I'm kind of a German pistol snob - That being said, however, I'm quite sure that you would be very pleased with the deal you would get on either the Sig P6 or the H&K P7...
OMO... Good luck w/ whatever you buy!
Regards,
Bones
ETA: I believe I paid around $700 for my trade-in P7 (which was graded 'A' by H&K - Technically a used gun, but just BARELY - The internals are pristine) - For just a tad more (like maybe $750 + S/H, transfer, etc.), you can get one of the 77,XXX serial numbered ones - imported by PW Arms, not H&K, which are, for all intents and purposes, brand-new guns, just without a factory warranty) - This is the route I would go if I were you...