I must also disagree with the roach/hydra thing. Honestly, hydras are just too weak for how slow they are. They do great DPS, but can't take any damage. This is a problem in an army that is made to die in wave after wave of crashing into your enemy from all sides.
First off, hydras cannot attack from all sides, they cannot get in good positions, and should be used primarily as a defensive unit. Secondly, an expensive unit that dies fast and deals almost no damage is close to useless. I would take roaches with extra upgrades over roach/hydra any day of the week.
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