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Also looking at your lists, I also prefer the 3rd. In only 750 points your opponent is going to be hard pressed to fight all your force, and you have a lot of threats on the board.
1 thing I might change though is the tyrant. Without giving him wings you could make him a cc monster.
130 something points. Frees up a few pts to give your other unit of stealers some upgrades. He makes a good counter unit. Say for example a daemon prince comes along. Your opponent will most likely destroy stealers first since they pose the biggest threat. The rest of your army doesnt really have the ability to take him out where he excels...cc. By taking the tyrant you ensure that if something big and scary in cc comes along you will have something to deal with it.
A tyrant with venom cannon I think just isnt as effective as a strangler fex. It can hit 3 times, but you actually have to roll to hit. Sure its strength 8 but I find that the stranger does the job just as well.
Only 1 word of warning, this could impare your firepower at this level. U could run a test game and see if it works or not.