The Ixus 220 is a very nice, very small, general purpose camera.
It has a wide lens, like you mentioned, but a standard tiny imaging sensor.
As I understand, you are about to shoot mainly indoors and for that you need
good low light capabilities. A good camera for those purposes need to have
a large aperture setting and more importantly, a large imaging sensor.
The Nikon P300 and Canon Ixus 310 both have a large aperture, but a small sensor.
They also both have a wide 24mm lens and will do better than the ELPH 300 indoors.
The S95 mentioned above has 'just' a 28mm lens, so it will probably not suit your needs.
It has superb image quality, thanks to its large aperture and large sensor. Alternatively,
you can go for its successor - the S100 - which has a 24mm lens and reported better IQ.
The LX5 suggested, together with the S100 are your best options.
-eyalg