Thanks for the input guys. I'm agree with the majority of the opinions expressed.
I like the PPSh-41 for the historical reasons, even with a BAFTE mandated "extended" barrel and shroud, after all it helped defend Russia against the German army and was effective enough that it was used by the enemy when captured. But I'm not excited about the 7.62x25mm round.
I like the Soumi M-31 for historical reasons, though it's got that mandated "extended" barrel too, it was instrumental in winning the Winter war for the Finnish and is the progenitor of the various submachine guns that followed. It is also chambered in my favorite round, the 9mm parabellum.
Both are expensive, but not ridiculously so considering the trouble gone to through the approval process, and extra magazines and drums are fairly inexpensive. I'm waiting to see some reviews of the quality, but I'll probably be getting one of these if the fit and function is good.
Tex