I think this is the last "body upgrade" question I'll need to ask for a while. IF I upgrade now, I'm set on the 60D or T3i. I've eliminated the 7D, I think it's just too much camera for what I really need right now.
The reason I'm looking to upgrade is for better AF, low light performance, and video ability in that order. I find the AF lacking when tracking moving objects such as pets or running kids. As for low light, I'm personally satisfied with pics I get up to ISO 800, but once it's at 1600 I notice significant and noticeably noise to the extent that I don't have many keepers at that ISO. And of course, the ability to go to higher ISO doesn't even exist with the XSi. I've started shooting more in RAW, but I also have to consider the needs of my wife, who I share the camera with. She shoots in JPEG only.
Based on my research, this is what I've gathered on the bodies, please correct if wrong:
IQ : T3i/ 60D will basically be identical and a very slight improvement over my XSi.
AF: The T3i will give me similar AF performance, the 60D will be noticeably better than my XSi.
Low Light: T3i/60D will basically be identical and slightly better than my XSi.
And of course, both will give me video.
So, it does seem like either may be a decent upgrade based on what I'm looking for. Should the better AF ability of the 60D swing my decision that way?
Another question is, would the improvements I'm looking for be marginal enough to justify just continuing to use my XSi and just save for a FF instead?



