Ummmm how about the WA2000
My choices would be H&K USC
or the Cx4 Storm..... but then you need to get the matching Px4 to it.....since the mags are interchangable with the correct models
my plans for the Cx4 got a big backset..... I got one PPsuper on hold in 9x18 with original woodgrips (the woodgrips I guess are harder to find than a needle in a Haystack from what people at the P38 forum told me)....and another one I got my eyes on in 9mm kz (.380ACP)
then I guess there is nothing else Walther to get but a PPK and P22 but there is plenty out there to have that a sideproject....