after the war, Syria if it has any money to do so or puts aside some money for procurement will most likely be spend on air defence and aircraft as both will be in a sorry state. Its navy has seen very little action during the war and should still be relatively in tact although could have suffered from neglect due to the conflict but basic patrolling along with Russia forces should be enough. Ground forces will have to make do with whats left over from the war, and any donations given by Russia. For short range AD they will most likely keep soviet systems in place but could also upgrade such systems as ZSU-23-4, Zu-23-2 with new radar and MANPAD or strela 10, as has been done by other countries. The 52-k (85mm) and KS-19 (100mm) could be upgraded similar to the Iranian Sa-ir system. ZSU-57-2 turned into iranian Bahman system, and any left over Zu-23-2 could also be used as Mesbah-1 system, these could all be done fairly cheaply and with help from Iran. The systems such as S-125, Sa-6, Sa-2, Sa-5 could be upgraded with help from, Russia, Belarus, Iran and China, but missiles stock would be dependent on what Russia has left in stock if any, as they have been shipping masses of these stocks into Syria. Syria if they have any money to procure will most likely buy more S-300, Buk-M2, Pantsir, and maybe Buk-M3, If there lucky S-300VM. its very unlikely to buy/receive S-400 or Tor-M2 due to the cost, and Israel throwing a hissy fit about S-400. Although a good radar network is equally important to network everything together. And although a decent AD network also needs the aircraft element of AD, buying ground based AD systems are cheaper buy and maintain than aircraft and are purely self defence system which makes it more difficult to other countries to complain or place sanctions, in compared to aircraft which can be used as a means of attack/aggression.
anyone elses views very much welcome