Well, took them out to the range, fed some rounds through them all, and have some impressions:
Bulgie Mak: looks like I'll need to get used to this one a bit more, before I start putting some serious groupings on paper. Had 2 failure to feeds on the 3rd and 4th loads, both on the second to last round, same magazine (I only have 1 mag), with two different ammo types (Wolf and Barnaul), so I hafta see what's going on there...
PA-63: All I have to say is... wow. I disliked the sights when looking it over before hitting the range, but... I was able to put at least 5 shots in the size of a half-dollar at 10yds. On my first magazine...
Much more accurate than I was expecting. That, or I had gotten into a 'groove' at that point in my shooting, whatever. Looking forward to future trips with this gun. Recoil wasn't as bad as I had expected, but maybe that's because in 9x18, I 'cut my teeth' on a P-64. ;D
P-64: Did just fine, though reminded me again that I still need to give recoil spring replacement more serious consideration...
Others: .25 semi-auto Berettas are fun to shoot (and one may even say 'cute'), but after the P-64, I couldn't see myself seriously carrying one. Also really enjoy my Nagant revolver... but sure don't enjoy the cost of feeding her those 7.62x38mm rounds (tried the .32 S&W longs once, didn't feel right about it).
Only problem now is... what to go for next. There's a TT-33 at the shop where I shoot (and I don't have one yet, just a CZ-52. That, and it would give me the step between the 1895 Nagant and Makarov

)... but I also saw a P-64. Haven't looked over either in detail yet, but they're only asking $175 on the P-64. :-/ Or there's the Webley Mark VI (WW1 dated)... or saving up for the 9mm Mauser broomhandle down at another shop.