I have taken a few classes from karen russell and follow her blog daily. She recently switched from Canon to Nikon. In the process she did a lot of research including renting the equipment before buying. She did a long blog post about the differences between Canon and Nikon...perhaps this may help you with your decision.
http://karenrussell.typepad.com/my_lifejust_not_on_the_ro/photography_tips/
Kelliann
I don't know if this has much relevance to the OP's situation - someone buying a $3,000 camera can get real picky about "AF" points! Of course the OP could read about the people switching from Nikon (or any other DSLR) to Canon on www.photography-on-the.net/forum but it did reference a good link for comparisons
http://www.dpreview.com/reviews/sidebyside.asp

I shoot with the a350, and don't usually shoot in live mode, but when I need it, my camera does come through!