With Sony, you would be spending that extra $50 plus some for the shiny S O N Y on the camera. Stick with Nikon, Canon, or Panasonic. Personal picks would be the Nikon Coolpix 7600, Coolpix S1, Canon SD450, or Panasonic FX9 (or its predecessor the FX8).
Regarding lenses, generally the optical quality of the SLR lenses are as ranking:
1. Leica
2. Nikon/Zeiss (Win in some areas with some lenses, lose with the others)
3. Canon
4, Newer Sigma/Tamron
5. The old Sigma/Tamron lenses
In regards to point and shoots, it alsmost does not matter as the lenses will most likely outresolve the tiny sensor in these types of cameras. Also, there is not usually a significant difference in recycle times between cameras using flash because the capacitors all take roughly the same time to recharge with a slight advantage going to lithium ion powered cameras.
ISO
You don't want to shoot these cameas at or above ISO400. Stick to the lower ones (ISO 100 or 50 for the best image quality). You will get prety bad noise at ISO 400 and even worse at ISO 800 if the camera goes that high.
Sorry if I seem critical of the point and shoot cameras. Just angry with the companies releasing crap and making it up with misleading advertising.