Here is a comparison of specifications for the cameras you listed:
I think any of those cameras would produce equal portraits.
None has any particular advantage.
But as far as excellent; that is in the hands of the photographer more than the camera.
Indoor portraits are a problem because of lighting.
Flash photos are not recommended for portraits, because the lighting is usually too harsh.
That means you really should be using flood lights.
If you positioned the person near a window, you could do well with natural light through the window.
To do this you will need to use a tripod because you will be using a slower shutter speed.
Since you should shoot portraits at 50mm to 100mm focal lengths, you will need to set the cameras you listed at about 3X optical zoom for your portraits.
Shooting at 3X means the lens aperture on any of those cameras will be approximately f/5.5
That means you must be careful about what is behind the person, because it will be clearly seen. The use of a colored sheet as a backdrop could work well.
I'm graduating in May and am looking for a point and shoot camera that will take excellent photos of people (both outdoors and indoors) because I'm going to have a lot of family and friend pictures.
The only other features I am looking for are decent battery life and a rechargable battery.
My budget is up to $220 or so, and I've identified these ones so far:
Panasonic Lumix DMC-FS25 12MP Digital Camera with 5x MEGA Optical Image Stabilized Zoom and 3 inch LCD (Black)
Canon PowerShotA3100IS 12.1 MP Digital Camera with 4x Optical Image Stabilized Zoom and 2.7-Inch LCD (Silver)
Panasonic Lumix DMC-FP8 12.1MP Digital Camera with 4.6x POWER Optical Image Stabilized Zoom and 2.7 inch LCD (Black)
Nikon Coolpix S3000 12 MP Digital Camera with 4x Optical Vibration Reduction (VR) Zoom and 2.7-Inch LCD (Plum)
Samsung TL 225 12MP Dig Camera 4.6X Opt 3 In LCD Red
Nikon Coolpix S570 12MP Digital Camera with 5x Wide Angle Electronic Vibration Reduction (VR) Zoom and 2.7-Inch LCD (Blue)
Canon PowerShot SD780IS12.1 MP Digital Camera with 3x Optical Image Stabilized Zoom and 2.5-inch LCD (Black)
I'd really appreciate your advice on which ones I should definitely rule out and which ones I should consider seriously- I'm so confused by it all!
Thanks and regards