I was about to say that you could check out 'Christopher Frith' in the UK, but one of the links said that he had recently retired. He had a lab at University College London, though, so you might want to check that out. There might be other people there working on schizophrenia.
Alternatively... I really can't say enough good things about the following lab:
http://www.maccs.mq.edu.au/
People there do work on cognitive neuropsychological modelling of schizophrenia, delusions of mis-identification, autism etc. Check out Max Coltheart, in particular, as their most prominant figure.
Here is a link to the 'belief formation' project:
http://www.maccs.mq.edu.au/research/programme/belief.htm
They also have a couple MEG machines and one of their research aims is to use it to find out more about the cognitive neuropsychology of schizophrenia:
http://www.maccs.mq.edu.au/laboratories/meg/index.htm
Sydney is also a very civilized place to live and the lab is a centre for excellence and is very highly regarded both inside Australia and across the rest of the world. I'd seriously consider it.
Not sure what is going on at Oxford, but you might want to check them out too...
Duke seems to do neuroimaging (if you are into that in particular). San Deigo... I'm not sure beyond that...