I'm not sure what you mean with fast. It could be fast autofocus, fast continuous burst rate or fast shooting.
- If it's
fps i doubt you can find a good performer around that price (who knows), most of the top cameras around that price offer 2.1~2.4 fps.
- If you mean
fast autofocus, there are some good models around that price.
- If you mean just
being able to take photos as soon as you press the shooter, well, that's a combination of autofocus, manual control and lens aperture.
If it's the latter, what you are looking for is manual control (Shutter Speed, Aperture, ISO).
I'm more of a DSLR guy so I'm just putting my grain of salt here. I recommend you to look at several models and reviews before making your final decision (check
dpreview, that a good site), I also recommend to do some research on what makes a good camera.
The ones that are popular between compact photographer around that price are
Canon PowerShot G15 - 450$ (it already comes with an optical viewfinder)
Panasonic Lumix DMC-LX5 - 389$ (
you can buy an external viewfinder for 120$)
The reviews are here:
Canon PowerShot G15
Panasonic Lumix DMC-LX5
Choose wisely, but remember a camera is a camera. Good photos depend of you not your equipment. Good luck