And here's a quick user review of 650D vs. 550D: http://forums.dpreview.com/forums/readflat.asp?forum=1031&thread=41872106
Thanks for the link, some interesting comments here:
"For me, as I process RAW, the image quality remains the same across the 550D, 600D, 60D, 650D, (I feel that these four are better image quality wise than the 7D)"
"Out of the 550D, 600D, 60D and 650D - the new hybrid AF makes the 650D my choice. I prefer it over the 60D which apart from a slightly higher frame rate/burst has little else going for it"