Canon cameras under 7 MP aren't really great .. however, the more you go up in MPs it keeps getting better n even better.. for example I personally like Canon EOS Series (EOS 400D) and Mark I-III are exceptionally well..
Canon IXUS 75 (7.1 MP) has not been impressive at all once I compare it with Olympus SP510UZ (7.1 MP).. Olympus gives better battery life, acceptable results, manual control, 10x optical zoom and ISO upto 4000 compared with all inferior counter features by IXUS 75. I think even price will also be comparable if not too less for Olympus!!
But I'd say again if budget is not an issue.. All Canons Rebel XTi (EOS) are simply great and give best results ..some of them lack video capture but picture quality compensates for it..
At 10 MP+ Nikon and Sony don't match Canon (in my opinion), however, at lower variants someone can enlighten us.. (Y)