I think building colony ship after 1 scout is best, to get the am going, but eh I could be wrong there.
I should note that as vasari you should upgrade hull FIRST and phase missiles second.
hull upgrade gives 13% bonus at level 2(but less repair than the other races get. But the repair rate means very little early game), and you should upgrade this as soo as you have a few assailants.
5/10% phase missile doesn't do much with the first pop cap.
Also with the Marauder if someone wants to kill it, you have a gigantic advantage.
Liek in that game with Jynx.. He kept trying to kill my cap which just made me have his LRMS go in circles and essentially put a 90% damage reduction debuff on them.
If you put your fleet on one side and move the Antorak Marauder behind the enemies LRMS, the lrms have to turn to fire, and lrms turn EXTREMELY slow.
Always remember to press q for phase out, as that's the hotkey, clicking is to slow for how fast you have to micro it.
Once the missiles come at, phase out before they hit. Then the lrms will automatically start turning around to try and shoot at your fleet on the other side of them.
Generally you can then phase out before they hit what they target of your fleet.
Antorak is the best cap imo if you heavily micro and are sure you can get it to lvl 5. I could link tons of replays where i've taken on forces 50% mines size(with similar mix of ships) by microing the antorak, and no, not against noobs.
However, Antorak is useless without micro. It's auto cast is horrible, it's armor is crap, it is the lowest DPS cap in the game by far, and so on. (yes, LOWEST. The vasari carrier or sova isn't lower as they have 2 squads to start with, and then get more!)
Also of other caps abilities rely on hitting with a projectile (ie ion, evacuators armor reduction/phase stopper, nanites, yada yada) If you're quick enough like I am you can phase out ships before it hits and it cancles out the ability.
You know the "omg overpowered hax" malice+brilliance? Yeah well, brilliance doesn't work when you phase out the target. Ion, and other such things, also work of course.
Oh and Skirmishers aren't overpriced.. they're overpriced for a starting unit. With the repair tech they are very good, but you'll want the cost reduction tech as that takes off 78 or 88 credits each one i believe (so after 20 you make back the credit cost of the tech)
And Sentinels are useful as tanks, not just counter. The only thing they don't tank is heavy cruisers and light frigs. Flaks have the highest survivability/cost of any unit. It's very hard to kill a bunch of flaks so it buys you time to build more assailants.
Sentinels are as good as I say.. I did bad with them in that 1vs1 due to my asteroid bleeding me bad (i just wasn't thinking

) and letting you have that feild while i went and cleared the ice to try and level up my antorak.