Mods pakilipat na lang po if i'm on the wrong forum...

Can anyone recommend a good cordless power drill?

1. Brand and model, with service center, spare battery, etc available here.
2. Just for the occassional repairs and DIY projects, so i don't need the really powerful ones.
3. Is it OK for relatively sustained operation, say mixing paint?
4. i noticed that Black and Decker drills tend to be cheaper than other brands; ok ba siya?
5. Does the voltage have any bearing on the power the drill has?
6. Will a 1/4-inch drill bit fit in a 3/8-inch drill chuck?
7. Lastly, which brand has the most available and cheapest battery replacement?

thanks!