> What about using an Energy Meter chip from ADI or
> Cypress?  If you just want to measure voltage, its a
> resistor divider, and SPI interface.  With the
> isolation between the chip might be looking around the
> same cost.  There is also an App note from Microchip
> on  using the PIC for energy monitoring AP939.  

I've downloaded the ADE7751 d/s from

http://www.analog.com/en/prod/0,2877,ADE7751,00.html

and

http://ww1.microchip.com/downloads/en/AppNotes/00939a.pdf

Will have a look through them later today, thanks

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