Great info guys..

Forums Computing What mini/micro PC? Great info guys..

Tony Rodda

And those NUCs are starting to come up refurbed on ebay for way less than £100!

As Dominic says, add a larger SSD (or better still offload images to a server real time) and bingo. 

I also looked at the Odroid with Linux.  An Octa-core machine.

Much appreciated fellas.