Very important feature..... yeah right! Well, firstly as others have pointed out, you've misunderstood it's use, but you're forgiven for that. And if you're going to do a feature-by-feature comparison, you have a LONG process ahead of you. Whatever brand you choose will have some advantages (and disadvantages) compared to its competition. And manufacturers try to convince you with fancy trademark acronyms (e.g. USM, SSM, HSM etc - these are all essentially the same)
Based on your criteria (pic quality, lens price, reputation, body made in where), there is no real difference. Each brand has dominated the pro market at different times for different reasons, and each has a great reputation. Rashkae put together a great thread on choosing your DSLR -- read that first (it's a sticky at the top of the Newbie section).
I'd recommend you visiting their respective showrooms and playing around with the cameras you have shortlisted. Ergonomics are very different, and different users have different preferences. By ergonomics I don't just mean the feel of the grip and body, but also whether the controls and user interface 'make sense' to you -- very subjective.
Hi Edwin,
At least you are kind and fair enough. Thank you for your kind understanding and your forgiveness.
However, if Canon really can only AF at centre point. I find that it is a very important feature to me and I will choose D90 over 60D even though 60D got others better quality.