How about the SA-8 / 9K33 Osa ? I think that might be a pretty good system to have in SAM Simulator. And it's not in Hungarian service so Hpasp could do it.
Hope this put the end mark:
http://simhq.com/forum/ubbthreads.php/topics/3561357/Re_SAM_Simulator.html#Post3561357
Aww.
I have SA-8 manuals, but the other two necessities I cannot provide
So, I guess after the ZSU-23-4 that's the end of new systems for this simulator? Though I hope Hpasp can give us new missions and bug fixes even if there are no new systems. Maybe one day a mission editor or generator too.