I've owned both the Mini 14 and the KelTec SU 16. I liked them both and they were both fairly accurate out to 100 yards. My Mini was a newer model with the pencil barrel, so it was a pretty good shooter.
The Kel Tec was bought as a backpacking rifle and plinker. It served those purposes admirably. I also felt it was a good concealable rifle and that has it's points as well.
I've not owned or fired a Saiga. They are popular and people seem to like them. I'm sure some Saiga owners will be along shortly.
BTW, welcome here. When you get a chance, head over to the New Members introduction area and introduce yourself to the gang.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams