650D or wait for 60D successor?

[Kombi]

I keep looking at similar upgrade options. I have a 550D
From what I've read
I believe the build quality of the 60D is better than the 650D. There is some weather sealing in the 60D, I have not read of any in the 650D
As for size the t4i looks to be very similar to your XSi where as the 60D is a bit larger.
If you haven't already checked it out there is a visual comparison in the review
http://www.the-digital-picture.com/R...ra-Review.aspx

The two are so similar in price and performance.... but I think I would still choose the 60D, over the t4i.
And assuming there is a 60D successor I would choose that over the t4i...
I speculate it will be more similar to current 7D, renewing the debate- new 60D or 7D...

There will always be a new camera model that will keep us wishing for the next, I'd look at what your Xsi isn't doing for you , that you feal the need to upgrade, and choose what best meets your needs.
From you post i think the 60D- or ideally a 7D(as you mentioned) would better meet your requirements.

P.S. welcome to the digital picture forums