the P7 are posted on the EE, usually from $1800 to $2000.
the members who have bought the PSP are all very pleased with theirs, and there are some test fire reports on the forum.
the big diff. between the two is in the location of the mag release, the P7 is the push button just below the back of the slide, the PSP has it in the heel, which is still quite slick from the reports, you squeeze down and forward, and with a pinching motio, take out the magazine. very good value at about $900.
the mags can be expensive though and hard to find.
i have two restricted walther PP's in 380 auto bought off the EE this year.
both made in west germany, post war commercial models, my preference leans to these, rather than the war production ones or the ones made in usa called ppk/s.
one was already in 380 and the other was originally 32 auto, but with 106 barrel installed, the slide has to have the "9 S" stamped over the cal. designation.
i paid $700 for one, the $825 for the other, shipping included. one was higher price because it came with a good number of extra magazines.
a ppk changed to restricted has the barrel really sticking out there, the pp ones have the barrel sticking out of the slide at 1 cm, still decent looking
the height and length of the restricted pp is not that much smaller than say, a browning hi power, where it shine is in the width of the gun, which is about 22mm across the slide.
good idea to plan ahead and put $ aside, for the time you get your restricted pal, regards.