I would love to have a TT-33 tokarev pistol or a Walther P38. Its pretty hard trying to find a tok that hasnt been rigged with the ghetto safety needed for import compliance at a price for less than $700.
I heard the Nagant 1895 revolvers are pretty decent and very advanced for its time. A cheap army surplus one will run you about 100 for a late 40's model. I believe its one of a very few revolvers that can be effectively silenced as well due to the cylinder-barrel seal characterisitics.
Glock 21 Gen 4. I keep telling myself I need a baby Glock for deep concealement but my typical concealment is a full size pistol in an OWB with my shirt over it.