One more vote for the Houge grip here. I know it wasn't one of your choices, but it really does feel great.
I'm trying to find a PK-AS-S (the one that sits straight up on the left side) red dot/black dot sight for my Saiga. I've seen a few on sketchy looking websites for way too much money. If anyone here has one or knows where I can get a good deal, I would be grateful. Thanks.