if you don't mind the little hose and a bottle on your back then go with a daytona or a modified Sun project, I have some JAC left in my collection but all of them need some work to function after years of abuse but once tehy are working it will beat any AEG or GBBR in performance. If the 4 you listed as your option then I would go with the Prime and teh daytona. Justin work is impeccable and you know it will last forever. the Escort eventhough it's reliable they will develop seal issue and like you said shortbarrel.
As for the Shoei (Lucky bastard) well send the internal to Daytona to get modified or upgraded, then it will be a beast.