Which Camara should I buy cannon or casio?

a Cannon SD1000, or a Casio EX-z77 exilim? The cannon has no Image stability but is a better brand..but I might need the IS because I'm planning on taking this camara to a concert with me and bands tend to move around alot! I don't have alot to spend on a camara and I need a small one to fit in my pocket....any suggestions???