I'll add to that:
Another way to put it is that a swaybar decreases the grip on the end of the car it is installed, and transfers a bit to the opposite end. If you are a racer then, the way to set up your car properly is to choose the correct spring rates to get the best grip and then tune the handling balance with swaybars. In fact, there are some who believe that the fastest setup does not use swaybars at all, and the idea is that you wouldn't need large ones if you got your spring rates right.
The reason street cars have swaybars at all is that the spring rates that get the best grip for racing are too stiff to be comfortable on the street, so manufacturers add bars to control roll and improve handling without impacting ride quality as much. It is always a compromise, however.
For a Metro/Swift there are a couple of things that are relevant to choosing a bar for a street-driven car:
1. If you are not running an LSD (and you probably aren't) then you need to transfer as much grip as possible to the front wheels.
2. You can't really pick and choose spring rates unless you have a coilover setup (you have some control cutting, but not much) and even aftermarket springs are likely too soft for best grip and transition.
3. Understeer is boring, but it's safe. If you have too much bar in back and not enough in front, you can turn your car into a FWD drift car, which isn't good either.
Given 1 and 2, for a FWD street car I think it's reasonable to install the biggest bar you can in the back first. If you now have a drift car, then add a bar in the front too--though I would try the smallest first so you don't lose the grip you need to hook up coming out of a corner.
If you are racing and can change spring rates, I'd go with just an adjustable bar in the back.
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http://www.teamswift.net/viewtopic.php?f=17&t=57216
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