I have chosen my basic design to base it upon. I will be making a custom layout based on the stereo VSPS design.
VSPS write up: http://phonoclone.com/diy-pho5.html
I put the included BOM into Mouser just for an idea of cost. It came up with £35 but we can make some serious savings from being inside an amp (no transformer or rectifier diodes for instance). I will be transplanting this list into Farnell (delivery is too much on Mouser).