Matthew, I have to disagree. You seem to think that designing a helo properl;y is more expensive or heavier. The ONLY helos that can experience jack stall are those mentioned in these threads, a small handfull (I want to avoid mentioning brands, this is not a commercial rant). It is not necessary to design substandard servos to be cheap enough or competitive enough, a thousand successful helos prove otherwise.
Don't give in so easily to the demon of crappy helicopters!