It's a solid list, like Karandras says though lone heavy destroyers will probably get a single shot off before they're gunned down.
Couple of thoughts from your comments though; The biggest benefit that your Immortals have is that those lovely S5 24" range guns are assault 2 so you can move them around killing things, keep them mobile and killing whatever needs to die. As for your warriors, park 10 somewhere safe to try to avoid phase out, on an objective is the best place for them if possible then try to keep the 'lith around 18" from all the squads using it to move the warriors around. Warriors are pretty poor but having ten appear in rapid fire range backed up by the S5 shooting on the lith is going to spoil the day of pretty much any infantry unit. Camping in cover at least gives you a chance if you're assaulted.